Ever since I've heard news about Fall of Cybertron I've had the feeling that the game may have elements that may play a role later on in the show like Shockwave,the Insecticons,and The Dinobots for instance. So the recant appearence of the Insection which was in fact refered as such in the show by Ratchet only confirmed my idea that Shockwave may not be far behind. If you think about it he may have created the Insections to be sentrys as well as armys since he is the creator of them and possibley responsible of Airachnid's existance. So Arcee and Jack may have alerted him about Vector Sigma and perhaps he may play a role later on in the show to possibley overthrow Megatron and start a conquest for both Earth and Cybertron. It may be possible that he may have tampered with Vector Sigma so that he may control Optimus or make him unstable to his own team. The Dinobots may also come into play too seeing how they have a history with him espically to thier leader Grimlock. Those are my thoughts and they may not be true but waht are your thoughts?