Yeah, he'll definitely be back. Though, it's really never explained why Reaghoul brought back him specifically, if he has the power to bring back anyone. The two also just sorta come out of nowhere, so there's a fairly big backstory waiting to be told, there.
Finished the season last night. It's... okay? Just a very low stakes season with very little plot overall. It's at least not nearly as dull as Ninja Steel was. Though, Void Knight's ultimate goal kinda made me want to see him win, if only to finally reveal to the rangers what it is that he's trying to do.