Harrison Nash Wells

He probably release Mobius so he can kill Barry by any means necessary.

I'm on season 6 episode 5 of The Flash so I would prefer NOT to talk about anything that happens farther than that. Thx :D

Then they could help Oliver as the Spectre to destroy Mobius temporarily and have Diggle say goodbye to Oliver with Barry and Sara and the surviving heroes can have their Pre-Crisis Memories intact on Earth Prime.

Did he just get a Extrapolator from the Council of Wells or something?

No, I'm not asking about how he's in Earth-Prime or how that affects previous seasons' wells's. (But that is a pretty interesting question)

But when the plumbers (I think that's what they're called) found Nash lying where the Monitor's base was, why couldn't they identify him as Harrison Wells.

(In Crisis Hour 5)

I mean some heroes beside the Paragons will naturally retain their Pre-Crisis Memories.

I simply cannot like Nash Wells. He simply looks as an irrelevant character that is just there in the Flash. His role in Crisis on Infinite Earths was just confusing, inconsistent and mostly pointless.