[Chooriwrocaxz]

I remember having read a post long time ago - from Mufti Husain if I remember correctly - stating that if the Imam makes something which is valid in his own madhhab, but that for the madhhab of the follower breaks the prayer (or break's one wudu'), the Salah of the follower wouldn't be valid.

So, if a Shafi'i imam bleeds before leading Salah, and doesn't take a new wudu' (since for Shafi'is bleeding doesn't break wudu'), the Salah of a Hanafi follower wouldn't be valid.

Or if a Hanbali makes masah on thin socks who are not adapt according to Hanafi standards, again the Salah of a Hanafi follower wouldn't be valid.

But I have read accounts of great Hanafi Ulama' (possibly even Imam Muhammad (ra) or Imam Abu Yusuf (ra)!) praying behind imams of other madhahib who did something who invalidated their prayers according to the Hanafi madhhab but not according to the Imam's madhhab, and still considering their prayer completely fine and valid..

Also, some days ago I've read an account of Sahaba praying behind each other even in presence of ikhtilaf about tahara issue (again about bleeding), but still considering their prayer valid..

I'd like to have some clarification,