4-Belt Error: What If There Were Always Four Belts? Pellone Edition.

"I coulda been a contender. I coulda been somebody."

Marlon Brando, On The Waterfront.

Being a contender meant something. Because of the proliferation of titles, it meant more than being a "champion" does today. Some say boxing is the only major sport with more former fans than current fans and the watering down of titles a big reason why.
Is there a fix or is a "Five-Belt Era" next?
How would the past look if there was always a 4-Belt Era ?
How many titles would Sugar Ray Robinson have?
Who best the most champions?
Would Harry Greb win a heavyweight title?
Would Muhammad Ali win a title at cruiserweight?
This is the book that had to be written -