I agree. There are going to be hiccups with any rookie player (and rookie coach, for that matter) and I would much rather those problems be present in June and July as opposed to October and November. The best training is on-the-job training and Walker is getting that right now.
That said, if the team is going to continue playing with the starters they played with on Friday, then perhaps they should consider making Onrea Jones (who I didn't see on the field once against BC) one of the four scratches and bring in Avon Cobourne. Walker could, and should, still start, but they could have Cobourne there just in case. Walker is going to have a game where he doesn't do much, every player does, and it would be nice to have Avon available as insurance.