Board Thread:General Discussion/@comment-34260455-20180118013149/@comment-34260455-20180120140442

Yeah, exactly. And since the Prime timeline now branches off the No Watch timeline from the point where Vilgax attacked Xylene's ship, any Vilgax we see before that point must be from the No Watch timeline.

Since we see Vilgax obtain the Chronosapien Time Bomb long before he attacks Xylene's ship, this Vilgax must be from the No Watch timeline--the only timeline he could be from at this point. Since it is this Vilgax that got the Chronosapien Time Bomb, it's entirely possible that this same Vilgax (from the No Watch timeline) was the one to team up with Eon and detonate the Time Bomb.

So yeah, No Watch Vilgax is entirely possible and likely given how the events of the episode play out.