Asalamualaikum Hazrat, 

A few friends of mine who recite different Duroods that are not from Ahadith, but claim certain pious scholar learnt it from a dream directly from the Prophet (SAW)? 

This sit doesn’t well from me? Is it such a thin permissible, and then to teach it to others?

If it is, then if the Prophet (SAW) abrogated something from the shariah, would it be put in place, or considered? If the answer is no because this has to be based on solid evidences, then why is it permissible to permit people to congregate, and engage in group dhikar of a durood, that’s nowhere from the “original” Sunnah.

I’d appreciate your input.