Iron Mike would have still been undefeated, but here is the post-fight interview:

Merchant: Mike, I think everybody here wants to know what happened to you tonight. You came from way, WAY behind after absorbing a tremendous amount of punishment against a virtually unknown fighter. More punishment than you have probably absorbed in all of your previous fights put together. Please tell us what happened.

Tyson: {fill in the blanks here}

How would this have changed the course of boxing history, had Tyson been awarded the 8th round KO that he surely deserved?