The episode order made some sense to me: in "James II" we see Finn acting cool about the arm, so we think he's okay with it already. By following up with "The Tower", it's revealed that Finn is still dealing with the trauma, and that he was just pretending like nothing's changed last episode.

I just watched this again and noticed something: in the scene where Jake's imagining his funeral to get himself sad, his kids are still pups. That speaks a lot about parents.