Seager's overall numbers don't look to be suppressed by an unexpectedly low BABIP, as his expected stats are all reasonably close with his actual on field results. His XBA of .220 is only slightly higher than his actual of .212. His XWOBA of .318 is only a little higher than the actual of .308, which looks to be a pretty typical spread for his career. As a predominantly left handed pull hitter with poor foot speed it's not surprising that Seager ran a very low BABIP, especially when you factor in the 13.4% IFFB rate.
Seager's league average WRC+ is backed up by the worst k rates of his entire career, along with a career high popup rate as well. There are also plenty of other concerning signs, as he swung at a career worst 29.1% of pitches off of the plate, while also suffering from a career worst 29.6% whiff percentage. In 2022 he had success against fastballs only, while struggling against all other pitch types. This coincided with a decrease in the fastballs thrown his way which will continue to be the case in the future unless he can either show the ability to lay off of breaking and off speed pitches or have more success against them. Seager is at the age where it's entirely possible he's starting to suffer from a skill decline, and I don't think he's likely to be an upgrade over what Espinal is able to provide, even when you factor in an expected drop in WRC+ for Espinal compared to what he brought in 2021.