It would have been an interesting arc to have BD change sides instead of becoming Silas' new attire. I have a feeling KO probably stumbled across another relic or a key and it gives him the sonic power. Not necessarily that he leaves the Cons. Sadly, KO seems to have the perfect personality to stay a Con. The only thing I could see making him change sides has something to do with Soundwave. Or... He has a complete meltdown and forgets who he is and his paint job obsession.