beta
I think his shoulder will give up on him in the next match. He will go crazy, lock himself up, and avoid seeing anyone. Don will try to get closer to him to comfort him, he will reject him like usual and let his temper mess things up but gradually he will open up to Don and maybe share his story and past which leads to how he got to this point, why he ended up being a bastard, how his jinx became a thing and why he is so obsessed with boxing. I think that's when we will start seeing some character development.
AND, he is definitely not drunk, son of a bitch wants to know what Don is up to lately and then fuck his brain out with some weird condom or something.