If Green Beetle changed the Scarab's settings, which gives Jamie full control, which mean that the Reach apocolypse is avoided, right? If the apocolyse is avoided, then Impulse never went back in time to stop Jamie so he wouldve dissappeared. So this can only mean...
What Green Beetle did was not efficent enough to stop the Reach apocolypse. The physics of time travel was always confusing to me.