I think Kevvie would be willing to drop Billy to the bench, but then Kevvie would put Smoothy on to start because Mozer is not ready to start. So that means Mozer is probably more so in direct competition with Smoothy.
However, I think the real competition should be between Walters and Smoothy on who is in the team as the starting hooker. We cannot have a hooker rotation of both Walters and Smoothy any longer, especially if it means Mozer misses out on a bench spot.
The bench spot should be Mozer's until he is ready to takeover full time as a starting hooker. If Billy Walters cannot find last year's form, then my preference would be to have a hooker rotation of Smoothy and Mozer going forward. Smoothy has overall been better than Walters this season, so he probably does not deserve to miss out on a spot in the team.