At the very least, he has answered a few critics. He has become one of the youngest world champions. More importantly, as Tick suggests, he showed a new style.
Before this fight, he ran in swinging and knocked everyone out, until he was found out. In this fight, he showed a more technical side to his game and though it still needs some improvement, it shows he is taking advice from other people under his belt. He has identified where things went wrong in the past and has begun to rectify these problems.
Well done.