The thing with guessing which Autobot this might be is that we shouldn’t think of it in terms of who makes the most sense (as many people wanted Beachcomber for the AWE Striker), but instead what recognizable and marketable characters are left. For Decepticons, those most evergreen and recognizable are Megatron, Starscream, and Soundwave. For the Autobots, it’s mostly Prime and Bumblebee. There’s a few others we might draw on, which would be my guess here. My best guess is Grimlock.