Champ's That Benefited From The Timing Of His Opponents Careers?

I saw the typo

 

Oh, easily Calzaghe. Good fighter, sure, but spent many years fighting non-entities in Wales, only to suddenly pop up and face Hopkins and Jones once they were no longer dominant forces. His is a career of good timing.

 

You project.

 

Marciano, Lewis, Calzaghe - masters of timing.

 

Mayweather is the poster child for this. Not one elite level great at their best.

Add Johnson, Marciano, Monzon and Tank as runner ups.

 

Almost every champion at any weight that ever was.
Is the question restricted to the championship reigns, or to the entire careers of the champions?

 

The nature of the sport necessarily means up and coming men will be meeting those on their way down,it's how the comers learn their trade and gain experience.
As far as a champion facing his challengers in defences,Marciano is one of the poster boys for getting his opponents at the right time.Johnson was the reverse,he beat his potentially most dangerous men when they were pre prime, what must be added is so was he,In title fights,he only faced one man older than himself ,Jeffries who was 3 years the older man.