Although your question is not empty of amphibology and ambiguity, it is necessary to pay attention to the following points:
Firstly, Mansoor Hashemi Khorasani is just a Muslim scholar who has risen up with the purpose of making Mahdi, peace be upon him, appear and bringing him to power, and invites Muslims to pledge allegiance to him instead of pledging allegiance to others, and in this way, he prepares the ground for the establishment of the pure and perfect Islam in this world, and for this reason, it is obligatory for every Muslim to support him. However, if it has been made clear to you and to some other Muslims, for whatever reason, that in addition to this objective and evident character, he is also a promised person, supporting him is a fortiori obligatory for you; as supporting him is also obligatory for Muslims to whom this matter has not been made clear; because this Muslim scholar invites toward Mahdi, peace be upon him, and prepares the ground for his advent in a perceptible and evident manner, and this is sufficient for every Muslim to support him; as God Almighty has said: ﴿وَتَعَاوَنُوا عَلَى الْبِرِّ وَالتَّقْوَى ۖ﴾; “And help one another in goodness and piety”.
Secondly, Does it matter to those like your honor who do nothing to support Mansoor Hashemi Khorasani, whether his honor is the very promised Khorasani or is not the very promised Khorasani?! Do people like you have no other work to do except to pry into this matter?! While God has obviously prohibited from such curiosities and has said: ﴿يَا أَيُّهَا الَّذِينَ آمَنُوا لَا تَسْأَلُوا عَنْ أَشْيَاءَ إِنْ تُبْدَ لَكُمْ تَسُؤْكُمْ ... قَدْ سَأَلَهَا قَوْمٌ مِنْ قَبْلِكُمْ ثُمَّ أَصْبَحُوا بِهَا كَافِرِينَ﴾; “O you who have believed, do not ask about things which, if they are shown to you, will distress you... A people asked such [questions] before you; then they became thereby disbelievers.”!
Thirdly, Your honor have decided in a opinionated manner about Mansoor Hashemi Khorasani and those whom you call “Yamani” and “Sufiani”, while this is not the way of religiosity and many Muslims have gone in the same way; Since on one hand, they have taken a conjectural and fake narration and on the other hand, they have paraphrased it in an illusory and unfounded way so that in the opinion of themselves, predict events and recognize the truthteller from the liar, while paraphrasing them above narrating them, is darkness above darkness and knowing them after predicting them, is a delusion after an imagination! Whenever they see an incident, say this is an instance of such narration, while they neither have known that incident truly nor have understood that narration properly! Therefore they call someone Sufiani and then look for Yamani and because they do not find him, say “Badā” has happened! As an example, a group of idiots in Iran and Iraq, have made someone more idiot than themselves, their leader and have called him “the promised Yamani” and now they have considered the emergence of Mansoor Hashemi Khorasani a reason to his rightfulness; Since in their opinion, the emergence of Khorasani and Yamani occurs at one time and responding to Yamani is more obligatory than responding to Khorasani! While their narration with this content, is a Wahid and uncertain narration and Wahid and uncertain narrations have no authority in Islam; As God has explicitly said: ﴿إِنْ يَتَّبِعُونَ إِلَّا الظَّنَّ ۖ وَإِنَّ الظَّنَّ لَا يُغْنِي مِنَ الْحَقِّ شَيْئًا﴾; “They follow not except assumption, and indeed, assumption avails not against the truth at all”; Rather their narration about this, is false and fake; Since on one hand, its only narrator is a cursed and malicious liar named “Hasan ibn Ali ibn Abi Hamza Bata’eni” and on the other hand, its content is in obvious contradiction with famous and mutawātir narrations which Imams of Hadith have mentioned in their Sunans and Musnads since the first and second Hijri centuries, and abviously imply the necessity of responding to Khorasani and hasting toward him “by crawling on snow” (حبواً علی الثّلج) and with the given description, relying on such Wahid, fake and rare narration, is just the act of idiots.
Fourthly, Scholars of the world of Islam on one hand, do not have the knowledge of the unseen, so that before “Mansoor Hashemi Khorasani getting started”, announce his coming and on the other hand, they may not do this after him getting started too; Since most of them are involved with their doubts and illusions and if they do their best, they may get themselves out of doubts in their religion. Given that most of them follow Wahid and uncertain thoughts and narrations and are attached to thousands of factions and sects and groups and with the given description, expecting them to support Mansoor Hashemi Khorasani, is an inexpert and thoughtless expectation. Yes, they have neglected to support Mansoor Hashemi Khorasani, but certainly your honor are not responsible for their negligence, rather you are responsible for your own negligence that just like them, you do nothing to support Mansoor Hashemi Khorasani. With this description, it is better for your honor to be busy with your own fault, not their fault.
Fifthly, Mansoor Hashemi Khorasani does not take allegiance from any Muslim for himself; Since he considers the allegiance only belongs to God, and his meaning by that is to pledge allegiance to someone whom God has commanded to pledge allegiance to and he is nobody except Mahdi that pledging allegiance to him is obligtory upon every Muslim. Accordingly, Mansoor Hashemi Khorasani takes allegiance from Muslims of this world for Mahdi; In the meaning that he takes promise and oath from them that if Mahdi appears to them, they protect, support and obey him and do not leave him alone like those who were before them. This is the context of the allegiance which Mansoor Hashemi Khorasani takes from every Muslim, and if sufficient number of Muslims pledge such allegiance to him, the grounds for the advent of Mahdi will be prepared.
Sixthly, Your speech with this content that “The only work that you personages can do is to just make Badā certain in the advent of Imam Mahdi peace be upon him”, is an ambiguous and illusional speech; Since it is not clear by “you personages” who exactly you mean, and by “Badā” in the advent of Mahdi, what you have intended! It is obvious that Mansoor Hashemi Khorasani is the only personage we know and the only work he can do, is to invite toward Mahdi and to prepare the grounds for his advent, and if this work in your opinion, makes “Badā” certain in the advent of Mahdi, then nothing will be better than “Badā” in the advent of Mahdi!
May God guide all Muslims to the right path and free them from misunderstanding and negligence in their duties which have surrounded them.
The website for the office of Mansoor Hashemi Khorasani
The section for responding to critiques