It doesn't matter what was the reason for quitting ,when you have heart/pride you just don't quit.
BTW Morales quit in the 3rd round against Manny .
Morales was washed up Che and still took about a 100 times the punishment that Brock took.
Erik came to fight, he would often trade when he didn't need to, that's heart and pride. If he was hurt and couldn't continue, so be it. If a fighter is hurt then that's their perogative, i don't want to see guys get brain damage for the fun of it.
There is a way to fight and a way not to fight. It can get abstarct at times, but i think you know what i'm getting at.