Lee has always been an enigma in that he was drafted in 2022 after they signed Correa. He was essentially shut out of a real path to the majors when Correa signed the six-year extension and Lewis was establishing himself at 3rd base in 2023. He performed adequately when he was needed as an injury replacement for Correa or Lewis. I could also argue that the rigors of full-time at SS is taking a toll on his offense. Again, we saw this last year with Correa. Correa struggled at SS. Once he was traded back to Houston and began playing 3B, his bat woke up (at least compared to what it was in MN) because he didn't have the toll of playing SS.
As for replacing Lee, I think a long-term perspective is needed. There is a looming MLB labor dispute, and we have no idea what a new CBA would look like. If you don't believe that the Twins have a chance at competing, it may be better long-term to let the prospects not start their MLB clock when you don't know how their clock may change with a new CBA. I would hate to use up a year of eligibility on a lost season when the timeline may change from six years down to 3-4 years. I wouldn't mind seeing Arcia come up and Lee getting sent down for a spell to reset his mind, bat, etc. I'm more uncertain about just calling up Culpepper and calling it a day.