Cresselia definitely needs to be re-tested. With the addition of Escavalier in the tier, Cresselia has one more thing it can be wrecked by. Galvantula, Accelgor, and Escavalier all threaten Cresselia's success in the RU tier, but at the same time Cresselia walls/checks quite a few things, such as Gallade, Hitmonlee, and basically any other Ground/Fighting type in the tier. Another problem is that Cresselia is pretty forgotten in UU because of the existence of Heracross, and even Chandelure. I think Cresselia should definitely get a re-test.
Venomoth is a no no, that thing is basically a Lilligant on steroids (and by that I mean it doesn't have to rely on HP Rock for coverage).
Durant would be rather interesting to see in the tier. Sure, it has great coverage and a great Ability in Hustle (not to mention 109/49/109 offensive stats), but actually Hustle can be a curse for Durant. Due to reliance on Hone Claws, Durant can only run 3 out of its 4 coverage moves (Superpower, X-Scissor, Iron Head, Rock Slide). Sure you could forego Hone Claws, but then there's the issue of -20% accuracy for all of its moves (and it's already hard enough to make Rock Slide hit). Also any Choice Scarf user can easily revenge Durant, even with its impressive 109 Speed. Durant is great, but I wouldn't mind seeing it back down in RU. Maybe if it dropped, then Choice Scarf Moltres would be a lot more popular.
TL;DR Let's try out Durant and Cresselia in RU; Venomoth is too good for RU IMO.