If they would have won game 3, they would have won the series - but you are technically correct, so lets look at Dirk's 4th quarter offense in game 6:
Shooting: 0-4 from the floor - 2 points total (free throws).
There is a reason that Dirk is labeled a choker (I didn't make it up):
Dirk's 2006 finals shooting stats in the last 4 games:
1. Game 3 - last 6 1/2 minutes 4th quarter meltdown (wen Dallas was up by 13) - 0-1 shooting in last 6 1/2 minutes.
2. Game 4 - 4th quarter - 0-1 shooting
3. Game 5 - Overtime - 1-3 shooting
2. Game 6 - 4th quarter - 0-4 shooting
So I guess Dirk "deer in the headlights" Nowitzki "showed up" in the finals, just not offensively in the end of the last 4 games - this is the worst "crunch time" performance of any "star" in NBA history - choke, choke, choke