Damn, that was a vicious left... ouch.
I think your analysis is right on the money. What was Overeem thinking standing in the pocket with this Beast?
Overeem should have focused on technique.
Maybe it's time for Overeem to throw in the towel, he's been KO'd enough recently. He's had a great career but I fear that if he takes anymore damage from head shots it has the potential to seriously reduce his lifespan.
Edit: I love underdog stories, and Frances' story is incredible.