I think he starts next year because there are no better options. That said, if they sign Bregman, his tenure at 3b should be over. There is no world where signing the reigning gold glove winner at 3b to play him out of position at 2b makes any sense- especially to accommodate Devers terrible glove at 3b.No doubt, but that’s partly because he's been generally very healthy and played many innings at 3B over the stretch we’re talking about. A bunch of productive hitters didn't play full seasons at 3B but were worse than Devers on a per-game basis.
Of course he’ll move off third eventually. Right now he’s playable, I think. His cumulative stats are “worst” in part because he’s within the band of playability at the position and hasn’t been moved off. If his bat weren’t so good, it wouldn’t be as valuable to play him there.
I bet there’s a way to game out the 2025 projections so that Devers DHs, Player X plays third, and Yoshida vanishes into thin air amounts to an incremental net positive, but I think it’s worse for the team, long run, to make that shift now.
Obviously, in that case they’d have to trade either Casas or, more likely, Yoshida. I suppose it’s also possible that they could still trade for Arenado as well, which is the other move that would necessitate moving Devers from 3rd. One interesting question is what happens when Mayer is ready to be promoted if Story is still healthy and 2b is being adequately covered by Grissom or Campbell.