Skyfire is also absent, but given his whole Situation, that might have been specifically mandated.
In any case, it'd be more accurate to say there's an odd absence of season 2 Autobots in the movie (perhaps indicating that the writers specifically made an effort to include all the Decepticons they could but were satisfied with the core Autobot cast they already had). It's just Perceptor, Blaster, and Grapple, and out of those three, Grapple's a nonspeaking cameo and Blaster disappears halfway through the movie.
In any case, it'd be more accurate to say there's an odd absence of season 2 Autobots in the movie (perhaps indicating that the writers specifically made an effort to include all the Decepticons they could but were satisfied with the core Autobot cast they already had). It's just Perceptor, Blaster, and Grapple, and out of those three, Grapple's a nonspeaking cameo and Blaster disappears halfway through the movie.