I think Mirko's just too overtaken by the allure of his famous Headkick. He's just so focused on that that he doesn't want to try anything else.
I mean, it's not like you can forget all those skills, it's just that they've been pushed back further in his brain.
Plus, if his doctor isn't lying, his knee is pretty messed up, and that makes mobility pretty hard.
Add all this to the fact that some his opponnents in these videos are top K-1 strikers.
I think this is one hell of an understatement. Mirko was one of the few guys to face every fighter in the top 10 atleast 1-2 times, and funny thing is that he beat everyone of them except Hug and Hoost.
That's one badass resume, and he held his own in all of them.