The bottom line is, Jake Peavy has consistently logged supurb seasons every time he has been healthy....and he hasn't been injured enough to be deemed "injury prone".
Let me rephrase the question, then.
Let's say Lincecum has another 2 seasons just like this year, and then he injures his pitching arm but pitches through it...and it is reflected on his performance.
Are you going to come on here complaining about his inconsistency?