How does this interact with blue sun? Does the lowered rez cost also apply to the amount you regain when you return it to your hand? Also I have to type more in order to ask this. I'm sorry, I'll take it down if it's a problem

Sadly Orion's rez cost is lowered permanently for each advancement counter on it, so unless you remove some after it is rezzed you won't be able gain money. —
It's still great though. You either drop it the same turn you Oversight it or you just advance it a few times to stop a rush or recover from Siphon. —
This is IMO *not* intended for asking rules questions like this. There are SO many resources for rules questions (GOOGLE, boardgamegeek.com, stimhack.com, ancur, reddit.com/r/netrunner, etc.), where this question was surely already answered and you can find it with minimal effort! —
Good thing that's your opinion, because this is the first place I go for card interaction clarification and possibilities. —