When you put full context on things its a definite NO from me. As mentioned already one example is Grebs wins over Walker, Loughran & Tunney.. they are greater IMO.. Why? WW & MW champion Walker beat Britton at WW, Flowers at MW, Rosenbloom at LHW & Drew with Sharkey at HW. All four are HOFers & greats at their weight. LHW champion Loughran beat Greb, Walker , Braddock, Carpentier & Baer at LHW. He also beat Sharkey at HW. One of the greatest LHW counterpunchers ever. Tunney beat Dempsey, Greb & the brilliant & overlooked multi weighter Leo Houck ... all multiple times.. becoming the LHW & HW champion. All 3 men are legit ATGs. As are Duran, Hearns & Hagler. But... Hagler as great a MW as he was never did anything after SRL. Plus the win was controversial.. Duran went up the weights , had an amazing career.. but did he beat some of the best LHWs & HWs of his time? Of all time in fact.... No. Walker did & hes the same size as Duran.. Hearns too .. what a fighter.. but again how impressive was his career in comparison when he went through the weights.. at MW he lost to Barkley ,didn't do much at SMW, got an excellent win over Hill at LHW & beat a once decent CW Nate Miller who was by then 36 & coming off two losses. Great wins for Leonard no doubt but i dont put them on a par with Grebs .. who by the way was actually smaller than Leonard & partially sighted too... and before anybody chimes in with the 'you haven't even seen him fight' ... I don't need to, we have his body of work & the men he beat.. I mean I never saw Bach composing but it doesn't mean we cant appreciate him or hold his work up against the Beatles does it
Hey man, I've got love for TNT and when he was an undefeated champ he was a high quality scalp - but he's an unserious inclusion on any trios list that has to go against the likes of Durán/Hearns/Hagler or Frazier/Foreman/Liston. He's a solid belt holder but not on that echelon of legends.
But Leonard didn't have much left. Hagler was active and Leonard had a layoff coming back from a dettached retina. Hagler should have won decisively as a true middleweight.
Hagler was fighting once a year for 3 years. He wasn't particularly "active". Leonard knocked out much bigger, but nothing special Don LaLonde and drew with Tommy AFTER Hagler. He had plenty left.
Greatness has f*ck-all to do with how pretty or technical someone looks on film, it's about how good the opponent was and if you managed to beat them.