Jolt befuddles me. He is a nobody in a sea of nobodies. A last minute addition at the pressure of Chevy, had like... Twenty seconds of screentime. Most of that in car mode, and all of it is "blink and you'll miss it." He's as hard to spot as Snarl is in the '86 movie.
Wheeljack, Hotrod, Crosshairs, Scorponok, Ravage, Hound, Strafe, Laserbeak, Sideways, Galvatron, TLK Megatron. I'd have thought any one of these guys would be more likely than Jolt.