Yep, he had all the tools. Great left hand, timing, power, speed, all there. Even though against Vitali he was out of shape, Vitali only won because of his great chin and enormous will to win. Some of the left hands Vitali took would've KO'ed the rest of the division.
Did you watch Floyd's career for the first ten years of it?? By the late 90's, he was the most avoided boxer in the sport and held that title for several years. All the "top guys" kept saying he was essentially high risk and low reward because he couldn't sell out arenas when he was campaigning between 130-140 lbs. I remember him literally calling out all the top guys when he was at the lighter weights and very few had any interest in fighting him. That includes Freitas, Casamayor and without a doubt Shane Mosley. I remember him at 135 lbs actually calling out the 154 lb kingpin and P4P stalwart Winky Wright. I don't know how serious negotiations were for that fantasy matchup, but you get the idea here. He called out a guy who was campaigning 3 divisions north of where he was at that juncture in his career. The guy challenged himself more than all of the fighters you mentioned. You don't go through 5 weight divisions and become the true champion in 4 of them if you don't test your mettle. By my count, he's beaten nearly 10 HOF or HOF bound fighters. Not one guy you mentioned on your list comes close to that accomplishment, and that includes the great Roy Jones Jr.
Mike McCallum, but not his own fault. He could have won at least half of his fights against SRL, Hagler, Hearns and Duran but was avoided.
I thought Castillo had talent enough that he could've done a lot more than win a championship and have a solid career. He underachieved because he could've been greater. If he didn't have the losses on cuts to Machado and Nashiro that stalled his career he would've had the chance to beat more top fighters in his prime, and we might be looking back on him as one of the all time great little fighters. I shouldn't call his career a "waste" though, because it wasn't because of discipline problems or avoiding tough fights. The second Ishihara fight was one of his most impressive performances... This content is protected
There are a few Eastern europeans which look really good then fall off the radar: Dmitri Pirog - got injured didn't he. Would've given Golovkin his hardest fight. Yuri Ramanau looked really good against John Thaxton, fought a bit like Brook, very unhurried (usually) Sergei Dzinziruk - was essentially avoided between beating Daniel Santos for the WBO titie and Sergio Martinez stopping him 6 years later. Had a great jab.
37 year old Braehmer after his body fell apart vs Cleverly has to be mentioned. Really good technical boxer, but he wasted his prime while protecting his title and career in Germany.