Not sure what stats you're looking at. Couch had more INTs than TDs, Sam has 21 more TDs than INTs, Couch had more fumbles than Sam, and about the same number of yards passing in 10 more starts.
As to Anderson, I watched him play here at Oregon State. Even caught a game when he was playing HS ball. The kid had a lot of talent but in the pro level it just didn't translate well. I followed him when he got drafted and really thought he'd be that guy after his 2nd year but he just makes some horrendous decisions with the ball. As to Kelly Holcomb... Really? Derek should have QB'd your team to a playoff. Holcomb would have ensured you never got there. He was worse than awful. Your team got to the playoffs in spite of QB play - not because of it.