I think it's totally fair to say that outside of the top six, there are depth issues. Those players have played 94 minutes and have scored 6 points (all from Walker) on 2 for 22 shooting. I'm not particularly worried about it, because our starters + Z are out of this world good, and Geno's proven over and over again that you don't have to go deep to have success. Like the OP, I agree that out bench has a lot of potential, and that judging a player on the first couple of games in their freshman season is not a good indicator for long term success. For a player like Walker, everyone wants her to have a Maya Moore style transition to college and be great on day one, but it's far, far more common for players to have bumpy, up and down first years.
But for now, I don't even see how it's arguable that we don't have a ton of depth that's ready for prime time.