Styles make fights. Mighty Mo is a slugger, he's not a good boxer, but he hits damn hard. So he can be easily outboxed if you have good movement and a good jab like Lamar has. Nothing new here.
I think if you look at the shift towards eruope boxing HW division over the last 20 years it tells you why K1/Kickboxing seems to have more depth. Alot of boxings great centers of popularity tend to have pretty small(height wise) populations while in the US its facing Football and Basketball drawing away the big athletic guys. Europe and Brazil on the other hand provide both a higher number of large fighters AND suffer less of a talent drawnm because size isnt nearly as important in football/soccer.
these k1 guys would do nothing in boxing, look if your not totally committed to the sport you will not go anywhere in boxing.