I have another theory: Duffee just isn't that good. Take a look at his resume: Duffee's biggest win is against ....Hague!!! Seriously!!!!! His record is poor. He has beaten only CANS...lower ranked cans to be more precise. And he got put to sleep by Russow with one punch.
And Overeem is 10x better.
Bigger, stronger, more skilled, better trained, more experienced.
Duffee was just there to collect a paycheck. He took this fight on 2 weeks notice and had a poor training camp.
Doesn't this make more sense?!
I think it does.