Not perfect, but moving on. Will see how it animates and maybe will add some supports to joints…
I messed up the buckle of the belt and had to decimate it as well 
Interestingly enough - Mixamo have issues with this one. Two issues - one is his jaw - it seems to be boneless in Mixiamo and swings around like crazy… The other is armpits - seems that the automatic vertex assignment failed and they are being stretched like crazy. Probably due to huge muscles there. But other than that seems that he animiates OK. And those two problem should be fixable when doing it by hand.