If Brook beats GGG then Brook vs. Andre Ward would be a good fight. Brook's 30 day weigh-in for this fight was 176lbs, so he can easily make LHW at 175. As long as Andre 'B-Side' Ward gets a passport for the first time, then I can see the fight being made in London.
Even Brook vs. the Winner of Kovalev/Ward could be possible. So if Kovalev wins Brook vs. Kovalev would be great. Eddie Hearn and Sky would sell the fight well.
I have it on good authority that should Brook win, he will be stepping up to fight Joshua at heavyweight. He is already struggling to make the 160 and it is expected his balooning will continue.
If Brooks wins, yes, why not. Then if he beats the winner of Kovalev-Ward he would probably be best going for a fight with the winner of Glowacki-Usyk. Ultimately the real test with probably come against the winner of a Joshua-Wilder-Fury-Ortiz tournament.
Realistically Floyd or Canelo would be the best potential paydays for him if he managed to beat Golovkin.
