Regarding the Moltres talk, if anything I would like to see it risen to A+ moreso than dropping. Moltres' STABs alone are insanely difficult to switch into with only the specially bulkiest of defensive mons and uncommon meta picks such as Rotom-H and Mega Ampharos (sporting a solid 0 appearances in RUPL as of the most recent stats) able to do so with any degree of reliability. Speaking of the defensive mons, two of the ones that give offensive Moltres considerable trouble in Umbreon and Cresselia have also fallen out of favor of late (1 appearance combined between the two in RUPL) and the increased popularity of Tyrantrum as a check to the other offensively threatening fire type in the tier, Salazzle (and consequently a decline of Rhyperiors in the same role), does not hurt Moltres either as even scarf Hurricane 2HKOs after SR.
In terms of sets, LO/FlyZ are nukes being able to even invalidate Milotic bulk mons from switching in and defensive SubTox is as good as ever now with the rise of Tyrantrum and Mandi straight up capable of pp stalling the former out of its most threatening move and just crippling the latter for the rest of the match. For scarf if you can look past relying on it to revenge Gatr, it provides unique advantages over other scarfers. Against teams with the ever popular scarf Garde/Ttrums Scarftres will likely be the fastest mon in the battle and add on that it 2HKOs every scarfer and the vast majority of offensive mons, it will provide pressure and speed control vs offensive teams like no other scarfer. Also add on that it is the second strongest scarfer in the tier only to Ttrum, U-turn (a trait shared by only one other common scarfer), and a unique set of resistances and bulk, there is definitely a defined niche for it.
Additionally, I fail to see why Moltres should be penalized so heavily for its SR weakness in arguably the most hazard removing friendly tier in USM with many defoggers/spinners not only in the highest ranks of the VR and beating most rockers, but also having incredible synergy with Moltres as well. Contrast with Golisopod, a mon that has skyrocketed through the VR in the past weeks in spite of an equally crippling vulnerability to SR in conjunction with Emergency Exit, an even greater need to constantly enter and leave the field because of the nature of First Impression (especially of the banded variety), and the lack of access to a reliable recovery move such as Roost. As mentioned earlier, Moltres' SR weak typing provides many useful resistances in the current meta such as being one of the few safe switch ins to the now ubiquitous Escavalier, able to eat Garde's tough to resist Moonblasts, one of the few offensive mons that forces the aforementioned Golisopod to think twice about clicking First Impression, and even being a fighting resist in a tier lacking good ones that can also beat most fighting types. I believe that there are good reasons why Moltres has both good representation and win rates in RUPL (10th in usage, and 58.3% win rate) and why its win rate is so much better than other high usage juggernauts in the tier such as Bronzong (38.46% win rate), Tyrantrum (30.43% win rate), Garde (42.86% win rate), Rotom-M (44.44% win rate), so on and so on.