You can't base how a sport runs due to people who don't have a clue about it, surely?
I agree he shouldn't get a title shot straight away, maybe a couple of warm up fights. But that said, I'm not 100% sure about how boxing (the biggest orgnanised combat sport) works but it's quite common to unify belts and stuff which makes it looks like it should work, giving both organizations work with each other.
In this case though, there's no need for them to work together cause he's just moving from one to another.
So considering he's already proved himself more than enough, he should be given it either that or only 1 warm up.
I waffled a bit there & changed my mind half way through that post but you see what my thinking was