If you compare the results of McCoy's first 7 games as OC with Leftwich's two games as OC the stats don't lie:
McCoy:
- Average of 12.8 first downs per game
- Average of 2.5 third down conversions
- Average of 24:50 time of possession
Leftwich:
- Average of 20.5 first downs per game
- Average of 6.5 third down conversions
- Average of 29:48 time of possession
So I agree with this small sample size this hasn't been the same stalled offense as Chopper has claimed. If you just compare the two Niners games, Leftwich's offense had 7 minutes more of time of possession, 10 more first downs and 4 more 3rd down conversions.
No one is claiming that Leftwich is the end all be all of Offensive Coordinators. There is a good chance that Leftwich isn't the OC next season. However for a rookie OC thrust into a difficult situation he has performed fairly well so far with all things considered.