Wait it'd actually be so funny when all the different stories of the Mech au start overlapping. Because none of them know almost anything about each other they'd be so confused.
Jazz, Prowl, and Swerve arrive on earth and meet Ratchet and find that this random ass Decepticon has been living on Earth for god knows how long and are just "How the hell did you even GET HERE???"
And then there's TexAid who haven't had ANY Cybertronian shenanigans yet so First Aid is just like "WHAT THE FUCK DO YOU MEAN THERE ARE GIANT ALIEN ROBOTS??? I'VE BEEN DEALING WITH A GHOST THIS WHOLE TIME!!" So everyone else has to deal with the fact Ghosts exist apparently.
First aid: ALIVE ROBOTS ARE REAL???
Cybertronians: You're literally sitting inside one..no?
First aid: nonono Vortex isn't robot, he's a ghost
Cybertronians: GHOSTS ARE REAL????
Deadlock staring at Prowl: The fuck you look like that?
Prowl: I scanned a Mecha. So I'm Mecha now.
Deadlock: Oh shit for real?? With lil human holder place and everything?
Prowl: Yes. It allows Jazz to...assist and control my movements in battle.
Deadlock: WAS THAT AN OPTION THIS WHOLE TIME???
Swerve: Ratchet. Ratch I love you but what do you mean the whole time we've been working together you had the ENTIRE DECEPTICON LIVING IN YOUR GARAGE??
Ratchet: AND YOU'VE BEEN AN ALIEN ROBOT THIS WHOLE TIME AND DIDN'T FUCKING TELL ME??
Swerve: I DIDN'T KNOW THAT ALRIGHT??
Ratchet: THE FUCK YOU MEAN YOU DIDN'T KNOW???