I don't want to get stoned by all of you. But Bonnar's chin is overrated. Yes, OVERRATED.
He has a very good chin and will keep coming. He doesn't back down in fights. But lets not act like it is a Hendo level chin.
Exactly who has he fought that are real "killers" with big power? He has fought literally no guys like this. Igor Pokrajac may be the closest one and he is a lower tier LHW.
Kingsbury, Krzyztof, Mark Coleman, a very GREEN Bones, Schafer, Mike Nikels, Forrest, TUF Rashad (even Rashad now), Jardine?
None of those guys are power strikers or KO artists.
Bonnar awesome chin has never been tested vs. a real striker since Machida back in 2003. Not even a brawler. Not even a semi-power puncher.
So in my opinion it is overrated. He hasn't been up against guys like Rampage, Fedor, Shogun, Feijao like Hendo has. So his chin can't be classified as such.
Not saying he doesn't have a chin. But he hasn't ate punches from a guy even a quarter as destructive as ANderson on the feet.