At that point the cons had gone from their highest point to their lowest point, under Megatron, they somehow managed to gather enough energon to force the Autobots off Cybertron completely and maintain it for a while, but their downfall was the attack on Autobot city on Earth, where the fated battle between Optimus & Megatron happened, thou I doult things would of turned out much differently if Megatron hadn't been reformated or just tossed out in space, Unicron would of arrived none the less, the only difference in the story would be that the Autobots arrive sooner because they not been delayed by the cons, of course the Autobots wouldn't of met the Junkons or Wheelie, plus the encounter with the Quintasons, thou I think about the biggest change would be Ultra Magnus likely openning the Matrix to light their darkest hour as the battle to save Cybertron rages on, of coursee none of the bots or cons would know the name of the Monster attacking Cybertron, yet it means little to them as its a common enemy that threatening their home world!
Aftermath, I would think Megatron would likely be still recovering from his fight with OP, Starscream would be trying to cement himself as leader (as he would do naturally) but the Autobots would likely have a strong force ready to retake Iacon and the rest of Cybertron and it leads to Megatron's arrest for his various crimes, the defeated cons would likely be given the option of spend time behind bars or exile to Char, where they can do whatever they like but not realising that Char is a wasteland of a planet and the cons would have to rely on hand outs from the Autobots to surive and Starscream's leadership would amount to nothing but a formal surender and him being one of the con leaders detained and locked away for good or at least until a con with a brain figures out how to break into the prison and free Megatron and the other officers detained, thou Starscream is likely to be one left behind to rot because he would be stuck with the stigma of being a traitor to the cause as he would be the one to formally sign the treaty that ends the war and he cannot be trusted, thus in the cons eyes, its a fate worse than death, to never have enough energon to escape but not die either! Naturally Megatron would likely escape Cybertron with whoever breaks him out and then he would likely work on rebuilding the Decepticons and getting a Energon supply that not dependant on the Autobots to get the cons over to his side, the Quintasons would likely do the stuff they did in season 3 but knowing who the Quintasons are will be a gap in their knowledge along with the encounter with the Junkons!
