Well, Wlad too. When he lost, he not only continued, he picked up to get western training and wasn't cocky to learn from western ppl a lot. His hybrid was very effective cos western training added to his EE training.
Lennox Lewis avenging his losses. Mayweather never lost but showed good improvement after his initially close bouts with Castillo and Maidana. Fury never lost to Wilder but coming forward in the re-match took most people by surprise. He went from being knocked down twice in a close draw to an absolute demolition job on the Bronze Bomber.
I liked most of your list - but not necessarily this one. I saw no great career progression from Chris after that Vitali fight. Losses to Adamek (a smaller HW) and x2 to Stiverne (he didn't learn the lesson about not sleeping on a quick, heavy-handed counterpuncher ). Sometimes his fitness was better. But sometimes it wasn't. He was lucky to get by Travis Kauffman (no great physical specimen by then, himself, and with more metal pins in his body than a Haitian voodoo doll). Chiris has more or less always been a brawler. Lucky for him he found another brawler (Kownacki) and they had a great time trying to break Compubox and their fists on each other's skulls It was a nice effort from Chris and it's reasonable to give him Ruiz's comeback fight. That's not a huge fight, though, and even if the unthinkable happens - Chris A. isn't getting any big work outside the PBC. And by that I mean he isn't getting any big work at all. We'll see if he's learned his lesson about fast, heavy-handed counterpunchers (see above). But at aged 40 I don't think that matters any more.
Notice the bias towards heavyweight fights, no need to point out why I'm sure you can figure it out. I don't care how you took your loss and if you avenged it, an L is an L. People making excuses for fighters is funny. AJ didn't learn his lesson up till Ruiz because he's never met a man who can take his shots & has a bully mentality. He should have learned/used the art of the jab against Whyte but he walked at him, gassed and got rocked. His "lesson" against Ruiz has left him gunshy up close and a nervous wreck. AJ from a few years ago would have blew through Pulev so in many respects he's regressed. Boxing at a high level is about control and having a big set of balls. When you're at the top level it should almost be natural no matter the situation, adaptability. If AJ was complete as people make him out to be then he'd have dealt with Pulev in 5 rounds max. He was overthinking in there...against Fury his mind might explode.
100% He was also a very gracious loser. All class. And even though the rematch was boring, there's no denying that his new gameplan completely confounded Ruiz.
You know what the hardest lesson to take is in boxing? Someone has your number and there is nothing you can do about it. Which is why an undefeated record will always be and should be scrutinized to high hell.
Froch v Kessler Spent the fight trying to bomb kessler out with one punch and wild swings. After this froch was much more content to throw in combination and with greater variety. See Bute fight. David Haye. After his first defeat became more patient turned into a bit of a back counter puncher.
Alexander vs Maidana. Maidana came in lacking motivation and it showed in his performance. There is a lot more to this story but this is the fight that woke Maidana up and he realized that a big change was needed.