Based on reality , and to be honest after the top 2 , the rest are all as bad as each other! in order , I would say:
Joshua
Wilder
Povetkin
Parker
Ortiz
Whyte
Brezeale
Takam
there are loads of others that I haven't seen enough of that could well be up there, and as for Tyson Fury, he can't be classed anywhere near it based on what we saw last week. When he steps up, he can easily be reconsidered and could go top 3 or 4 , but I really can't see him ever being no.1 . could be wrong.