I appreciate your detailed response defending Merab. Browsing the forum I just saw tons of empty picks for him without reasoning. I think the differences boil down to how you and I rank skills. For me, the resume doesn't matter as much as implementing their skills in a fight. Back when Islam was getting a title shot, I vigorously defended him despite only beating Green and Hooker. So it's possible I'm biased from that.
I'll post my breakdown and maybe it'll clarify my perspective.
Wrestling: I'm biased towards Dagastani, until anyone shows superiority over their top guys, I automatically rate them highest in division. Merab probably out wrestles everyone else.
Umar 10
Merab 9
Boxing: I don't think either guy would be a great boxer without their grappling, but Umar basically decided to stand with Sandhagen and beat him. I have never seen Merab comfortable enough to really decide to strike without blending TDs/pressure.
Merab 3
Umar 7
Kicking: basically same as I wrote for boxing, Umar has better kicks than punches. I can't even remember an effective kick by Merab besides a distraction from his pressure.
Umar 9
Merab 2
Physical Strength: both guys are strong for the division, but Merab usually is a cardio machine that overwhelms, has been match by Stamann kind of. Umar has never struggled with anyone.
Merab 7
Umar 9
Cardio: I think Cardio is Merab's bread and butter, he can melt anyone that can melted. However Umar's teams conditioning is legendary and the way he passed the 5 round test with Sandhagen without a beat makes me think he's going to be much more unbreakable than Yan or Also were.
Merab 10
Umar 9
Intangibles: I think there's a whole aura of invincibility from the Dagastani gym, any top guy from Khabib's team basically is unbeaten, besides the fluke Islam KO loss. Merab's unlimited cardio is pretty scary to most, the way he beat Yan, but he's had plenty of moments in fights where he lost control and looked clueless.
Merab 7
Umar 9