I take it Golovkin is just considered by the by now? Because it really might still be him. Teraji also needs a mention. But yeah, I guess Bivol is a very good pick.
Teraji may be the best pick of the lot, his jab is educated, variable and dominant. I've never seen his jab not be the primary weapon with which he destroys his opponents.
Tyson Fury if he was more consistent with it but his elbow joints are knackered. The log he was throwing in the 2nd Wilder bout was deadly. ATG jab.