Artur Grigorian is an ATG at Lightweight. Laszlo Papp is an all time top ten middleweight. Luis Rodriguez is 11-14 numbers below Kid Gavilan and Jose Napoles at 147lbs. Sam Langford was not as skilled a boxer as Bob Sapp.
If my pfp list included skill and H2H considerations (at there weight) as well as achievements and Résumé I have no doubt Ezzard Charles would be number 1
The WBA, WBC, IBF, and WBO are largely insignificant titles and can not be compared to the World Championship of old (pre-1975 or so). I refer to them as "organizational titles." For example, Mike Tyson winning the WBC title at age 20 is not on the level of Floyd Patterson winning the pretty much universally recognized world title at age 21. Deontay Wilder's 9 WBC title defenses is not on the level of Muhammad Ali's 10 (second reign) world title defenses.