I keep thinking Evan Engram. I don't know that he's as athletic as Fant.Imagine if Mallory get's in the swing of things. Hell, you could argue that he was a way better deep threat than brevin, minus the YAC ability brevin had.
As for NFL potential, Mallory is well on his way to playing a role similar to Noah Fant of the Broncos. Not really used in-line, but has the ability.