Speed stat? Quick attack? You're arguing 100% game mechanics lol. Yes, in-game, scary face doesn't affect moves with increased priority, but in a vsbattle, scary face would slow down a quick attack user. Not saying it will nullify 2nd gear, I'm saying it'll make it so Luffy's would not have a net speed boost (and likely have a speed decrease)
Trip explained that Tranquil can land critical hits more frequently to Ash, for one example off the top of my head. I'll find evidence when I'm on my pc if really needed but it seems like you're denying it for the sake of denying it.
Cool, but that's through stretching his limbs. Like I said before, Krook has the advantage as he can immediately fire off earthquakes with a range of 10s of kilometers.
I've already debunked that. The things you listed are all contact-based. Luffy isn't gonna be resisting eq.
As a further advantage to Krook that isn't on his page, we consider Pokemon to have access to their egg moves, meaning that he has stuff like attack reflection at double damage (counter), immobilisation (mean look + sand tomb) and more versatility. Small advantage, but it adds up
Even if you did argue that Scary face slowed down Luffy, he still has precog and 2 speed enhancing techniques stacked. To say that it would lower both and take away both speed amps is a little too much.
Again, just hearsay until scans. Also, if what you are saying is legit, it's probably because tranquill has super luck.
He also has conqueror's haki which will affect him from kilometers away.
Yes, they are also physical hence why the term is "physical contact". Check a dictionary if you need to confirm this.
Luffy still has precog and incapacitation with haki. And I haven't even been arguing them. Precog makes less attack's from krok hit and krok gets incapacitated by conquerors.