i don't think brook is the best at 147 but i do believe he would beat guys like maidana pretty easily, brook for all his issues is heavy handed, maidana would walk forward and catch some big shots and get taken out, i can't see the fight going any other way. i could also see him doing a number on berto. Guys like ortiz and guerraro would be pretty decent to watch but i'd favour those 2 to beat kell same with bradley.
i woud have to see it maidana is a elite fighter with great power kell had problems with carson jones maidana is a whole other level