@ Senpai - Allen obviously doesn't want his surrogate bro to join, it's just that he's barely clinging to life at that point so he doesn't have enough energy to try and dissuade him. Ironically, Allen is his only reason for joining
I'm gonna write that part of the flashback later, can you read it?
Side note - What's with the Cry emoticons? I didn't think it was that depressing.