Just look at not just who held the titles from 1980 post Holmes, but look at how long they held the titles.- they past the belt continously

Then notice that it took Tyson to unify the belts.

Don't we like our divisions unified? it was a pass-the-belt-era, no dominating HW existed.

And since Tyson's camp paid Lewis stepaside money- we didnt see him fight Lewis until wayyy after prison, when it was a circus fest. He didnt fight Tua, & remember Forman said he came out of retirement to fight Tyson.