1. His "work" against Ikhwan al-Muslimeen is pretty much nothing but the concoction of lies against its leaders. 2. The ones who praised him did so unaware of his treachery, and would most likely have relinquished their support of him if Bakr abu Zayd's research on Sayyid Qutb was carried out before they died, for example. 3. I think you'd have to prove that he is a master of Hadith. I haven't heard of him doing much in the field after receiving his degree. If Madkhalis are the best representation of Salafism, then may Allah end the Salafi movement.