I'm not an Ubers player, so I can't comment on Swagger's viability in the metagame. However, having followed both this thread and the OU thread, I feel like there are a whole lot of people who are failing to distinguish between something that is uncompetitive and something that is unbalanced, particularly those who are making the slippery slope argument. Something that is unbalanced is simply too powerful compared to most other elements in the metagame; there is little reason to use anything else instead of it. This tends to affect the metagame by causing overcentralisation - most teams will centralise around this element, ways to counter it, ways to counter the counters, etc. OU and the tiers below aim to remove elements of the metagame that are unbalanced, aiming for a diverse metagame where a variety of elements are viable. Ubers, on the other hand, is the refuge for unbalanced elements, a place where a meta consisting of teams built on Xerneas, Xerneas counter, Xerneas counter-counter and filler isn't a problem. Something that is uncompetitive, on the other hand, isn't necessarily successful in the metagame. It may generally be a bad idea to use it. However, what an uncompetitive element does is significantly reduce the chance that a better player with a well constructed team will defeat an inferior player with a poorly built team. Unbalanced elements still require skill to use. Everyone knows of one gimmick team or another that, in the hands of a skilled player, has been used to climb high on the ladder. A well built OU team can, due to the poor level of player quality at the bottom of the Ubers ladder, have a degree of success. Even though the Ubers elements are unbalanced relative to OU, they must still be used with skill to have success. Swagger relies on turning the game into a series of dice rolls; Moody and OHKO moves fall into this category as well. Ubers already has a precedent of banning elements that are uncompetitive, but has only ever banned one element that is unbalanced, Sleep Clause, and that took an extreme level of overcentralisation to be justified (if the reports in the Gen V Suspect Test discussion were anything to go by). There is no slippery slope from banning Swagger (uncompetitive) to banning a hypothetically overpowered Primal Kyogre (unbalanced); bans for balance go against the very nature of Ubers, but bans to maintain a competitive metagame are at the very essence of what Smogon aims for. There is also no slippery slope from banning Swagger to banning ParaFlinch or Confuse Ray, unless it can be shown that either of those two elements has a significant impact on the liklihood of the better player with the better team winning the match (at which point it ceases to be slippery slope and becomes entirely justified).