I could see Starscream pairing up with Lockdown as a "for the time being" thing. Then when he sees Galvatron, he'd go back to serving him. I definitely missed Starscream (or any of the "hero Decepticons" for that matter) in Age of Extinction. Galvatron was *awesome* of course, and Lockdown was really cool too, but Lockdown's not even truly a Decepticon. All we had was Galvatron and a bunch of drones (though I did love the two-headed Shockwaves ) I'm holding out hope that along with Galvatron in the next movie, we at LEAST get Cyclonus and Scourge as non-drone Decepticons.