Is it permissible to pray behind a Muslim who venerates and sanctifies Sufi shaykhs?

If a person's glorification of the righteous reaches the level of extremism (ghuluw) that expels one from the faith, by believing that they control the universe or by supplicating to them instead of Allah, then prayer behind him is not valid after establishing the proof against him; because his innovation is one of disbelief (mukaffirah). However, if his glorification does not lead him to disbelieving extremism, then prayer behind him is valid.