First, we knew Smokescreen was going to be a repaint of Knock Out all along. We were just hoping he'd be slightly retooled to accommodate his wings.
Second, Smokescreen is sure as hell not a minor character. You could consider him a secondary character, or even part of the main cast at this point, but not a minor character.
Also, Smokescreen has been shown to have a Cyberverse Figure (with Cyberverse Knock Out's lower half) that is based on his current incardination
rather than a beast.
Although the Dinobots have been hinted at a lot lately, and at this point it's highly possible for their introduction.
Let's not let the sub-title of "Beast Hunters" make us think that all vehicle based Transformers are going to discontinue. The Autobots are going to be vastly outnumbered, and need upgrades. The writers have told us to watch out for upgrades before. The toyline confirms that.
Not to mention a [horrible] Soundwave upgrade
Also, there's a rumor we're getting Jazz & Perceptor in Season 3 as well.
Otherwise, great theory.