This does not reflect the views of the council, but is solely my view on how to improve this metagame (Although now you have the viewpoints of all council members so you can probably piece it together).
On Quickbanning Pidgeotite
Against this. Even leaving aside the time factor, banning stones on a quickban is to me even more of an issue than quickbanning Pokemon, by a large factor. It can be necessary, and just looking at our banlist I think it's pretty clear that it was several times, but I don't think Pidgeotite warrants it. At the moment, the only thing I think can be considered remotely broken with Pidgeotite is Xurkitree (Even anti naganadel people should see that Naganadel's power isn't derived from Pidgeotite), and I'd much prefer to suspect that. My preferred course of affairs would be:
1. Suspect Xurk + 0Tol* Pidgeotite
2. If issues continue (such as via Xurkitree staying unbanned or something like mew becoming broken) suspect Sleep
3. If issues continue (such as via Xurkitree or sleep staying legal or zap cannon also proving too much) suspect Pidgeotite
but I would be readily amenable to swapping 2 and 3.
*In which 0tol means that it stays, but if it comes up again between whether to suspect Pokemon or Stone we go stone
On unbanning Shaymin-Sky, Deoxys-Speed, Darkrai, and Pheromosa
I would support a Shaymin-Sky unban after a ban of either sleep or Pidgeotite; the same goes for Darkrai, as while they are potent special attackers they are very much manageable without that additional threat, and would be nice additions to the fast special attacker pool rather than simply relying on Naganadel or Tapu Lele for pretty much everything.
I wouldn't support a Deoxys-S unban post Pidgeotite ban or Zap Cannon ban, but I would support it being suspected back in. Given that it was not banned solely on the effects of Pidgeotite, I don't agree with unilaterally returning it, but do believe it has the possibility of being healthy.
I 100% would not support the return of Pheromosa, via suspect or otherwise. In all honesty, Pidgeotite was essentially irrelevant to its ban, and the metagame hasn't changed to the point that it would be a good introduction to the tier.
On more proactive Quickbans
No issue in theory, but while I'm split on whether it was right or not to quickban Marshadow I'm against that being applied to Naganadel as well. Regardless of it staying or going, I think both the thought process and results were, if not optimal, at least pretty good. In all honesty, I could very well see more Ubers being entirely healthy upon an unban, although for obvious reasons we would need to be very careful. One potential better way to handle these newly released uber-ish Pokemon, however, might be to create a suspect immediately upon their release, after which they may be allowed in by majority vote rather than having to be suspected out.
On Quickbanning Naganadel
Re: Saving time while we have other suspects: If it is to save time re: Pidgeotite, my preferred solution would be to quickban it, get whatever solution to Pidgeotite is optimal (Banning mons, banning sleep, banning zap cannon, banning the stone) out of the way, and then have a scheduled, additional suspect test similar to those outlines in the previous paragraph to potentially bring it back in.
Re: Quickbanning merely to remove it: I'm not a fan. Its handleable both defensively (Magearna, Aggronites such as mew, Ditto stall teams, Blue Orb Steels, Specially Defensive Ho-Oh, Necrozma Dusk Mane) and offensively (Espeeders, Weavile, Ditto again, Offensive tanks such as Primal Groudon, Scarfers), both by extremely solid answers and ones that are already in common usage. It may be considered broken, although I do disagree, but not to the point that on its own merits it should bypass the suspect test.
On Suspect Testing Blissey
Not unless major metagame changes come into play in addition to the ones above. Its handleable, both by special attackers such as Keldeo, tapu Lele, Magearna, Volcarona, Xerneas, and Lunala, and by plenty of physical Pokemon. It doesn't really block rocks, although it does make them harder to set, and is incredibly passive. It's never been anything near our previous bans in effectiveness or splashability, nor does it have other characteristics that would propel it to ban regardless.
Tl;DR
Complex Pidgeotite solution
- If banned, release Skymin and drai, suspect Deo-S
Different solution to quickbans
Do Not suspect test Blissey