So why would Scourge act on Shockwave's behalf when announcing the war was over when Shockwave considered him a fugitive?

Also, what's the deal with Scourge being separate from the Cybertronian shutdown? In this universe, is it that Unicron created Scourge for some reason and he went to Cybertron to observe Shockwave? What were Scourge's motivations and who was he working for?