Thanks for a great update post Sage! I'm here with your discussion points, so enjoy!
Discussion Points
Kommo-o A- -> A: A rise has been supported pretty heavily throughout the last couple pages of the thread, though the ranking council is still torn as to what to do with Kommo-o. The consensus is that it isn't quite as strong as Mega Altaria currently, due to its worse longevity and struggle with four-moveslot syndrome across all of its sets. It still does have insane versatility and Z-move access going in its favor, however, but whether or not this is enough to push it to A is something worth discussing for a little while longer, especially considering the presence of several other Dragon-types capable of revenge killing it.
Kyurem A- -> B+: Kyurem hasn't gotten worse directly, but it could be argued that its niche in teambuilding is less needed now. With Gliscor and Serperior gone, its Ice-stab is slightly less useful, as well as Mamoswine dropping, who brings a more distinct niche as an offensive Ice-type in strong priority and the capacity to use Stealth Rock. While this drop may not be needed, it isn't out of the question, especially considering Kyurem's relatively low overall usage.
Alolan Muk B+ -> B: Recent trending offensive threats take advantage of Alolan Muk's one dimensionality even more than before. Terrakion is especially important, but even new threats like Mamoswine and the rising Crawdaunt all get free switches on it at least once. It can still provide fairly invaluable utility, however, maintaining its status as one of the better Latias answers the metagame has to offer while combating Hydreigon and rising Psychium Z Celebi sets quite well.
Jellicent B -> B+: Jellicent has been a super valuable pick in tournament play lately, finding itself on a lot of bulky teams as a way to pressure opposing defensive Pokemon and check key fat breakers like Lucario. It's typing is very useful for checking a multitude of Water-, Fighting-, and Fire-types, too. Taunt sets are also making a splash due to taking on several balance staples, like Florges, the Slowbros, and Empoleon, very well, though its struggle to fit every move it'd like on a set, occasionally middling physical bulk, and weakness to Hydreigon are also to be considered when evaluating its rank.
Crobat B -> B-: Crobat continues to nose dive from its peak relevance in gen 7 where Grass-types were everywhere. The offensive grass-types that do exist right now in Celebi and Rotom-C are both immediately threatening to Crobat on the switch, and Rock-types like Terrakion, Nihilego, and defensive Stakataka rising hurts its usage elsewhere. It still has utility as a revenge killer of Fighting-types due to its fantastic Speed tier, however, while Super Fang + Taunt sets are likely in need of some more exploration, making a hypothetical drop a tricky decision.
Mega Blastoise B- -> B: Blastoise has picked up some steam, seeing decent usage in Smogon Snake Draft as well as UU open. It tends to have a good matchup vs prototypical Hippo / Empo teams, as well as being a spinner that threatens rising defensive Pokemon like Jellicent and Slowbro. Its susceptibility to a lot of faster threats and longevity issues do hamper it, however, which brings potentially keeping it B- into question.
Chesnaught B- -> B: Our favorite knight has seen lots of usage on bulky balance and semistall teams looking for a different option than Klefki as a Spike user, as well as being a useful blanket physical check for a lot of threatening Pokemon, like Choice Bnad Scizor and Cobalion. It also appreciates the increased presences of Crawdaunt and Krookodile. However, it is still easily punished by several top threats of the metagame, like Latias, Mega Altaria, and Togekiss, and can have a bit of a hit-or-miss typing at times given its several common weaknesses.
Hope you guys enjoyed! Thanks for the great discussion we've seen these past couple weeks. Keep it up, stay kind, and happy posting! :)