Chuck may of learnt new stuff but once he was in the Octagon, he couldnt implement it.
The fact is the old Chuck ran through nearly everyone in his way. He didnt need to keep his fists up then, why should he now!
The issue is, is the game has changed up on him. He is too way gone to evolve with it. So i guess the game is up.
However i tip my hat for the stuff he has done and willingness to scrap with the best and not moan.