I actually made a threat about this after the fight, but it was thrown away for some reason. Space to move for a HW kickboxer against a slugger is a big thing. The more space you give Overeem, the better he can time his kicks, plan his attacks and avoid inside brawls, where he's at a disadvantage, and also collisions, which are a coin toss at HW.
Overeem was outstriking Rothwell 3 to 1 before he missed in a collision, so he should be able to do better with more space. JDS doesn't need as much space since he's a boxer, his distance is closer even when he fights from the outside.
I think there's a much higher chance that AO loses to JDS in a rematch than him losing to Rothwell. Losing to Rothwell via KO is like losing to Nelson via KO. Meaning if you're a champion kickboxer who can strike in MMA, you should be able to outstrike them.