It's important to remember, De Leon was also the best chip the Dodgers really had for improving 2B and the present-day offense/team in general. Bellinger could have gotten a 2B, but losing him would likely hurt the offense as soon as they needed a LF or 1B which is expected soon. (Same for losing Urias hurting the present day rotation if you want to consider him.) Alvarez, Buehler, etc. -- none of those guys individually brings the value of De Leon at the moment, and by the time you add other prospects, those packages will likely hurt more than the De Leon-led package. It's possible that the Dodgers had a pessimistic take on De Leon too. But he was also clearly their best chip for reasons other than that. Keeping De Leon for depth this year, and trading away, say, Alvarez plus Calhoun instead to fill 2B, isn't necessarily in the best long-term interests of the Dodgers either, even if they liked De Leon just fine.