I dislike the way Yoko acted towards Joe. Understandably so as she cared a lot for Rikiishi and she is still in the initial phase of digesting his death, but this "female character bitches over protagonist only for her to respect and admire him afterwards" is a card that I've already seen used many times, in Berserk with Guts and Casca as an example.
I found that brawler who aggravated Wolf's chin injure a pretty interesting character, although pity he won't show up anymore. Pretty collected and watchful of everything, also knowing his limitations and knowing how to pinpoint someone's potential. Joe wasted him when he bad mouthed Wolf and that's understandable as he feels kinda liable for what happened to him, maybe aggravated by what Yoko said earlier.
Joe's resolve is complete now... he saw that living a life of regret and lamenting over Rikiishi won't do him any good and he'll probably kick in with his goals. All the scenes showing Joe's struggle up to this point were very well made and a realistic representation over someone with this much grief.
I've finished the 55 episodes of the old anime and should switch to episode 2 of the newer one. Pity that I won't listen to this amazing track the old anime offered again, definitely one of its strong suits.