Did meldrick taylor lose his prime in a single blood and guts war with JCCHAVEZ?

on legendary nights boxing experts say when you fight wars you are not the same fighter as before,and chavez fought dozens and dozens of wars so why do ppl say chavez was still in his prime when he was 89-0?he was in his prime when he was 49-0 a href="http://www.youtube.com/watch?v=pFQ2oJ3asaM" rel="nofollow"http://www.youtube.com/watch?v=pFQ2oJ3as…/a