He has written a book "Ghayat At-Tabjeel wa Tark Al-Qata' fi At-Tafdheel" on the topic. Although the book was written to prove that tafdheel issue comes under valid difference of opinion, but it also clarifies his own opinion on it i.e. he prefer Ali over Abu Bakr, RadhiyAllahu 'anhum. Nothing weird, he is one of staunch defender of Ghumaris.