Think Mousasi wins this one relatively easily, find it hard to believe that senior citizen Dan Henderson is going to be able to beat him with his deteriorating game that was only built off of one punch even during his youth. I think Mousasi's striking defense is too good for that to get through, and Henderson hasn't been able to wrestle anyone to a victory in a long time. Even if he does take him down Mousasi is better off his back than Henderson is on top.
At this point I think Henderson should take a old legends type of fight versus someone like Wand then retire. He has had a storied career and there is no way he will get a title shot in either division let alone beat either champion.