Quarry is a MUCH better fighter than Gassirv. He would pummel Gassiev. Murat wouldn't know what hit him.
Quarry got the best of much bigger punchers than Gassiev. I reckon he’ll knock out Murat in the mid to late rounds.
The problem with Gassiev is how underdeveloped his style is. He is a very good body puncher, left hooker and ... That's about it. He has never properly learnt how to cut off the ring, improve his head movement or how to properly lead with his jab, things that would have immensely benefitted his style and would likely have him near even the top of the heavyweights right now. Unfortunate because he was very talented physically. Quarry points.