This has been the matchup that first comes to mind for me too, when it comes to Umar. I don't know...I've stated a billion times that pressure and forcing exchanges is a weakness in the Abdulmanap crew, he was pretty clear in how he developed his fighters to avoid that zone as he felt it left the highest margin for risk..thusly they aren't the most comfortable or skilled there but are good at avoiding it. Yans fantastic in the pocket but can his footwork trap Umar reliably enough? Or will Umar be hard to find, the younger, longer, quicker Umar with a great kicking game which we saw throw Yan off a lot on the feet vs a much less skilled striker in Aljo. Also Yan still gives up the first round so I don't love his chances in a 3 round fight, in a 5 rounder (which it should be) I really do wonder. I favor Umar though. Umar is good at slowing a pace down and controlling it, plus figgy took him down I think Umar might too.
Would love to see it. I also wouldn't mind Umar taking a step back first to boost morale, fight a Montel Jackson/Kyler Phillips/Martinez bout then get back to contenders.