What if Jynx had Ice Body?
Jynx would be a terrific hail abuser, and would easily shine as a fast and powerful sweeper. Its ability would help it, as it can cure off a little LO recoil as it constantly fires powerful Blizzards, and is less easily worn down. It can also use Substitute+Protect+Ice Body, and it can use Lovely Kiss as well to become even more annoying. SubPlot Jynx would definitely be much more lethal as well, being able to get quick HP much more quickly, and grabbing NP boosts while firing lethal Blizzards. Scarf Jynx could also get a little more HP as it revenge kills, which makes it a good Scarf user in general. Jynx is already a good hail abuser, but I'd easily prefer Ice Body over Dry Skin on hail teams, and this would bring its hail abusing prowess to even greater levels.
What if Carracosta learned Rapid Spin?
One thing's certain, if there was another tier shift, Carracosta would go straight to RU. Carracosta could easily become one of the best Rapid Spin users in RU, having more bulk than Kabutops as well as Solid Rock and Sturdy. It can be one of the few Pokemon that can actually be an excellent team supporter thanks to this, supporting its team with Stealth Rock as well as Rapid Spin providing terrific support, and unlike Sandslash, it's actually gonna do this job well. It has enough power to get past the spinblockers such as Golurk and Rotom, while having Rock solid bulk. It can also do a Shell Smash set with Rapid Spin to break past all of the spinblockers in RU while pulling off a Rapid Spin, and its Speed and power gain could give it a sweeping chance. Carracosta's nice power and bulk also allow it to defeat some common hazard users in the tier; Steelix, Scolipede, Crustle, and Rhydon are just to name a few.
What if Claydol was RU?
Ah Claydol, the first thing hated on the masses, even before Metang. That said, I think Claydol would be good in RU. It won't be anything special, but it would be a good Pokemon. Claydol has good bulk as well as an excellent support movepool, which would make it a decent support Pokemon. It has Stealth Rock to support its team while it has Rapid Spin of course. Its main advantage that would make it a good Rapid Spin user is that while it doesn't have the offensive prowess of Kabutops and Cryogonal, Claydol has two key things over them; it has some useful resistances and is also indifferent to every kind of hazards (Cryo is weak to SR, Claydol resists it). Claydol could also be a useful support Pokemon, with Trick Room, dual Screens, and weather being useful things. Outside of that, Claydol could face competition as a support Pokemon from Uxie, who has greater bulk, although Claydol's extra resistances do come in handy sometimes. Claydol also outclasses Sandslash pretty much entirely, as it has better overall bulk and indifferent to hazards. Trick+Ring Target can also be fun to surprise spinblockers. Overall Claydol will be a decent choice for a Rapid Spin user, giving a secondary option over Cryogonal for stall teams, and finally giving us a Ground-type spinner that doesn't suck cock the way Sandslash does. (and if there were more tier shifts Sandslash would almost definitely land in NU, lol).
Well, I oughtta keep this discussion going, so...
What if Umbreon was RU?
While this would never happen, given tier shifts are most likely done and Umbreon is a Top 5 Pokemon in UU, but here's what compels me to ask this: Umbreon used to be RU. Umbreon could easily be one of the best special walls in the tier, and Foul Play would make it better than ever. It has WishTect+Heal Bell to support its team, and if Dusclops was with it, they could make a nigh unbreakable duo that could make stall powerful in RU. So how would this do?