Let it go, Stallion. The demon is dead and can no longer troll us.
As for the MegaGross debate, as a wallbreaker I find it hard to compare to other wallbreakers in the A+ ranks. On one hand, I generally like it more than M-Gard. M-Gard has access to Taunt and Wisp, but you don't need a Mega to abuse Taunt or spread burns, and while it hits harder than MegaGross, I'm not sure how important that is:
252 Atk Tough Claws Metagross Meteor Mash vs. 252 HP / 0 Def Mew: 202-238 (50 - 58.9%) -- guaranteed 2HKO
232 SpA Pixilate Mega Gardevoir Hyper Voice vs. 252 HP / 0 SpD Mew: 226-267 (55.9 - 66%) -- guaranteed 2HKO
I know that 8% is arguably a big deal, but 2HKO is a 2HKO, and while Metagross has less power, it has a much larger coverage pool to cover more ground than MegaGard.
My only issue is when you compare it to MeGallade. When MegaGross encounters something it's not carrying coverage for, it can have a hard getting over it and likely requires support to overcome it. MeGallade, on the other hand, can muscle over most walls by setting up SDs while sitting in that same nice speed tier. In return, MegaGross can also be a nice end-game Sweeper with Agility, which gives it a little more versatility than some of the other wallbreakers, and by versatility, I mean being a wallbreaker versus being a sweeper, not carrying Taunt versus carrying Will-o-wisp. I think this versatility is just enough to push MegaGross to S, though admittedly I would find it to be more of a lower-S threat like pre-ORAS Keldeo.
As for MeGallade, once again as a wallbreaker I believe the fact that it can muscle over a lot of its walls without relying immediately on other teammates is a very useful trait for a wallbreaker. While Bisharp and Mega Heracross have similar claims to fame, MeGallade benefits from being much faster than both of them. I would argue that you could run Shadow Sneak on MeGallade, giving him priority as well, but Bisharp's priority hits harder and I don't know if MeGallade can afford to run it. Also, while Defiant is awesome, it can be played around, so it's not the be all, end all ability.
All in all, I would support Mega Metagross and Mega Gallade to S mainly because the former is arguably more versatile than any of the wallbreakers in A+ and the latter is able to better muscle through walls on its own without immediately relying on team support, giving it more independence than many other wallbreakers. If they don't move up, then at the very least I would keep them together because I don't think either is better or worse than the other.