Re: Bida'a...
in addition in saying that the Prophet "lead" the prayers and that its "sunnah" to pray in congregation, you're being more than a little misleading. Refer back to the quoted sahih tradition on the abandonment of tarawih in congregation. The prophet prayed it a certain way, people gathered behind him of their own accord and started praying behind him. When he changed the way he prayed (in response to that) they asked did you not see us, supporting the fact that it was something they did themselves without any encouragement from the Prophet. He had seen them and upon their persistence in this act he changed the way he prayed.
i fail to understand how something the Prophet never explicitly encouraged (thus people asking if he hadnt seen them) and infact implicitly discouraged (by changing the way he prayed in order to avoid congregational taraweeh) and never suggested it be started after he dies, can then be spun as "sunnah"