Just finished these three up last week. Garboil's from Energon Divebomb and Howlback's from Armada Cheetor. I wasn't going to originally do anything with the minicon, but I decided to do just a little paint work and decided to name him Hot Wheel. They can really fit into either the Classics-verse or the Dawn of Futures Past story. In the Classics-verse, they'd pretty much just be upgraded versions of themselves like Overkill. In the DFP story, I'd have them working for Razorclaw and spying on the Tripredacus Council for him. But in either continuity, Hot Wheel's leading the way (yes, I named him that just to use that line).