I think he's always been a racer Jen, just if you qualify and pole and have the best car which keeps you at the front for most of the race it's very easy to think he can't overtake. He may not be as aggressive as, say, a Lewis Hamilton but look where that often leaves him, up in front of the stewards or parked by the side of the track watching everyone else whizz by.
14 DNFs for Vettel and 9 for Hamilton to date