How do we know that Russ is not just audibling aways from Bevell's calls?
Well, the fact that we tend to move the ball just fine in situations where you would expect the QB to do a lot of audible work (ie end of halves, end of games, when trailing and needing a score to keep the game close, etc) suggests that when the QB is expected to audible you can expect the offense to do better.
Therefore, unlikely Russ is doing an audible all the other times of the game but moves away from them in key moments where we need the offense to succeed.