Springer is 34 at a time when aging curves have become more normal so there's less reason to expect he'd be as good as that again. Slightly better than last year maybe.
Vlad has played at 2021 levels, 20% of the time. 1 out 5 full seasons. Again there is not a lot of reason to expect that level of upside, even if he was better than last year which we should at least expect.
Given that, you're not talking about much upside, but mostly hoping that Varsho hits better to compensate for not having Belt anymore, and Kirk is better to compensate for IKF being much worse than Chapman. Meanwhile KK is probably not going to be as good as last year cause he's also 34 and probably outperformed his peripherals last year.
Schneider also performed out of his mind for his stretch which is unlikely to repeat. Those are not 141 PAs we're getting again from anyone.
Given that, again it looks less like a reasonable upside and more like we're hoping to just match last years performance at the plate. The real upside part of that, where we exceed last years performance, needs Springer to not have aged, Vlad to return to elite hitting, Varsho hitting like 2022, KK repeating, and Kirk hitting again which seems more like the 95% outcome. There's a chance there but it's not so likely.
Maybe I'm wrong about that, but Belt and Chapman were good hitters or at least decent hitters in Chapman's case, so we were already starting from a deficit when looking at needing guys to bounce back to past form (Plus those Schneider ABs).