It's the only feature I'm divided on. If they're feral, can't their eyes be yellow or green or some other color beyond red/blue? At least Lockdown has green eyes to represent his neutrality, and Devastator was described as a monster different from the average Transformer so with him green eyes was fine. But perhaps they were once Decepticons who deserted the war or something. It may be a point of exposition like with Wheelie and Jetfire.