The guys he fought more than once, he averaged 3.4 bouts against. AVERAGED, spread across SIXTY-FIVE guys!
That is truly insane, BTW! He faced his average opponent by a factor greater than 2x! That's just mind-boggling, utterly fascinating stuff.
How many guys in recent years can you think of that had 3 or more trilogies? :think I think Pac and Morales both had 2 such instances (including their own)... And I'm drawing a blank beyond the addition of Holyfield, who I also think had 2.
El Magnifico was a terrific recent fighter with just two and combined they effectively ruined him and contributed to not only his prime but his career being over by the age of thirty (Larios & Márquez).
Greb had 2.4x as many rematches - at 158 - as modern era iron man Bernard Hopkins did times he fought, period (66).
Clay/Ali: 11-0 (5) Henry Cooper - WTKO6 in the rematch. Sonny Liston - WKO1 in the rematch. (legit, STFU about it) Floyd Patterson - WRTD7 in the rematch. George Chuvalo - WUD12 in the rematch. Jerry Quarry - WTKO7 in the rematch. Joe Frazier - WUD12 in the rematch, WRTD14 in the rubber match. Joe Bugner - WUD15 in the rematch. Ken Norton - WSD12 in the rematch, WUD15 in the rubber match. Leon Spinks - WUD15 in the rematch. That's actually fantastic. Nothing but high quality there. He ought to be on the poll.