Is Thurman's chin underrated or porters power not all that?

Surprised Thurman's chin held up, after seeing him stunned and wobbled by lesser fighters and forced into the running man, I was really impressed that Thurman stayed in the pocket and at times even stalked Porter. Great fight although I thought Porter deserved a close win or draw, close split decision loss at worst. I think a lot of boxing purists can't stand porters sloppy style but I see improvement every fight and love his attitude and work rate, I would love to see a rematch against Thurman or Brook.