I'm all for theorymonning how Uber mons would be in OU, but please don't seriously consider it. These mons are Uber for a reason, why can't you accept that? The reason why stuff like Deo-S and Darkrai were dropped was because there stats weren't so buffed up. There is a large difference between 600 and 700 bst, zamazenta is the single exception because it stuffed by two of the best mons, among other things that I can't be assed to include. Luiga has a bad typing, low power and 4mss by UBERS standards. Stop saying "oh, x has bad typing." Deo-D has bad typing, yet it was 11th in usage. Just because a mon has flaws, doesn't mean it is bad, it means it isn't insanely broken. 90 attacking stats is not bad, they are only a bit below average. Deo-S could get away with 95 attacking stats, so lugia could absolutely.
I want to drop all the things like Lugia and Skymin into the tier for a week to shut up people because the metagame will become a shitshow, believe me.