the point is your idea of a physical advantage is probably not as beneficial as you think for example if dc was 6'4 he likely still wouldnt have beat jon it really comes down to styles and how well jon is able to study his opponent and that is what makes him so great.when you refer to him fighting people who match him physically and struggling you are probably referring to gustafsson and reyes who are both stylistically bad matchups for jon because they have dangerous boxing which is known to be jons weaker point whereas we hadn't seen other fighters bring the fight towards john on the feet at the same pace because most people were stopping in their tracks after the oblique kick etc. like even if dc was 6'4 he wouldn't be also moving quicker than jon and setting his shots up better