wow a 1:30min clip to prove that RJJ had a good chin. This clip isnt even half a round long. I could show you many more clips showing RJJ having a weak chin
This whole thing is odd. The first fight he took a lot of clean shots! But in the 2nd one big shot got him down. It is strange. Don't know what to make of it. Maybe this fight took a lot out of him. He took those shots like a champ, very strange. And this was after the weight issues. I think the weight and Tarver just broke his chin.
Chin or no chin, he was an excellent boxer in his prime no doubt.... he never showed any weakness until age 34 ffs, give him a break.
There are more fights from his prime where he was hit hard and took the shots. All your examples are of a shot mentally and physically deteriorating Jones. Tarver, old age, and the weight broke his chin.
The move down from Heavyweight is what finished him. He should have realised it was gone after Tarver I and hung up the gloves.