Can't see how that deal is good for the division. Yes, cross-platform fights, such as Lewis-Tyson and Mayweather-Pacquiao, have been made in the past, but they required huge, world-wide demand. I think it's very possible now that Fury/Wilder/Joshua never fight each other (again in the case of Fury-Wilder).
IIRC it's:
Hearn: Joshua, Chisora, Takam, Povetkin, Hrgovic, Whyte?*
Warren/Arum: Fury, Pulev, Jennings, Rivas, Ruiz
Haymon: Wilder, Breazeale, Kownacki, Joyce.
(*Whyte may switch platforms (probably to Haymon) if Hearn doesn't offer him a better deal than the one Whyte saw as insulting a few months ago and quickly turned down.)
I can see each platform keeping everything in-house i.e. no platform co-operation. Grim thought, as that would **** the division just when it seemed to be getting good.