@SrSamuel
The main idea of return is that Ippo should be decide himself that he should aim to the top. Not out of obligation, not out of pity or whatever. He should decide - "let's do it!".
I don't think it will be something forced.
There is a conflict between Ippo's desire - and he wants to...
RIP coach
At this point I have no idea what might make Ippo return to the ring. It would be tragic and the coach won't fulfill his dream but well...But Ippo really needs something to push it forward.