I definitely think he would've been considerably better if he started earlier. More training time but most important no riches. More drive. More hunger. No bullshit like getting mad sparring partners hit him in the face. He always reacted very poorly in fights when he got hit in the face which is just part of the job when you're a fighter. It wasn't a chin issue. It was a mental thing. Getting hit in the face is pretty fucking shocking. You gotta have it happen during training. Brock reacted like a guy with a naturally decent chin who just didn't know how to react to getting punched in the face because he wasn't accustomed to it