You always have to take it at least a little into account. I have been in the corner of him taking all the time he needs, but ignoring perception when the perception can undermine your standing with your bosses, coworkers, and fans, is just not reasonable. Especially not when you are the main guy in town. Then it begins to directly impact your standing as such. You would like the perception to be that you would run through molten lava for your team, leave everything out there on the floor, bleed for them. People will follow that. Fans will respond to it. Management will value it. Not important whether you actually would or not. You can't, or at least shouldn't, go out there and risk further injury over it, but you can't be pulling Pejas and missing time with boo boo'd pinkies either. Just looks bad. If its just a question of pain, and not of further injury, then your reputation and status becomes more important than short term physical discomfort.
Kevin would have done better having a broken leg or some such -- just sounds worse, and people take a lot longer to start questioning it.