Before Ben went on to reveal that the spooky envy specter was still in Arthur’s amputated arm, I had the headcanon that the gang never got Lewis’s body out of the cave, and so the spirit went on to take it
Because who needs functioning bodily organs when you’re a specter, right?
Omg, this thing could turn into like an epic adventure/battle against the bad spirit and regaining Lewis body! And if the body was repaired maybe Lewis and come back!!!! 😱
This is actually what I would perceive the main plot of a story around these characters to be.
Perhaps even maybe a future fancomic plan from me?