He needs to win here, but if he losses, there's no other way but to move up in weight, though it will not hype him but IMO, that's the right thing to do for him to be comfortable in maintaining his weight. He will have to start his journey in a new division and hopefully we will continue to support him.
What we are talking are just the possibilities, but it might change if he wins the rematch.
If he moved up after being defeated by Martinez, is there any fighter at the good rank that is willing to pick him up as an opponent?
In most cases, a top-rank fighter will just choose an opponent within the top ranks too.
But I have to agree with anyone here that no room to discuss the moving up for now.