Board Thread:Television/@comment-11220539-20171103051010/@comment-3048593-20180722044756

With it being implied in the season 5 finale that he might've ceased to exist, due to his room being empty, I hope once they say something along these lines once he's found.

Daisy: "Deke!? I thought you disappeared!"

Deke: "Turns out my Multiverse theory was correct!"

If I remember correctly, he brought up the theory to her specifically when they were in the future.