Good chin doesn't have to do with being TKOed or not , it's the punish you can sustain and how you are unaffected by big shots. Ben was dropped by Pettis 4 times in their fight and dropped by Cerrone and dropped by Jim Miller so I'm sorry awful candidate, he's very durable and good at surviving but not because of his chin.
Nick Diaz applies the exact same , he gets dropped a lot he has by no means a strong chin , he's just durable and amazing at surviving , it's not because of his chin though.
Same applies for Jake Shields , Kampmann dropped him , GSP dropped him , Hendo dropped him , he's just great at surving , very durable fight it's more of a heart , mind and conditioning thing.
Leben eats BOMBS Anderson and Stanns beating were TKOs.... I think that should be proof enough but the Akiyama fight , Wanderlei , Terry Martin , Cote and so on...He has a iron chin.
Rampage...DID YOU SEE WHAT SHOGUN DID TO HIM? He was conscious. I haven't seen him withstand a beating like that anymore though , Rashad and Machida dropped him without HUGE SHOTS. I can agree with discrediting that.
Does Anderson have a amazing chin? Sonnen dropped him 2-3 times cleanly and obviously so I doubt it , Anderson is just about impossible to find when you're striking he could leave his chin at home most nights , doesn't mean it's a strong one.
Hendo....has one of the best chins in the sport ever for sure.
BJ Penn , I'll agree he has a great chin , I don't think I've ever seen him dropped.