The title shot is set. Logic dictates, face or no face, the champion in a weakened state is more vulnerable.
Then again, you can have Punk get ticked off and then eat a spinebuster...
The title shot isn't set if Punk is injured, and incapacitated and isn't able to compete this Sunday.
Plus, Batista wanting someone else to beat Punk up before Sunday, would essentially make him a, pussy. The kind of character he has would want his opponent at his strongest.
True...
That's I guess why I can relate to the heel line of thinking better.