One more thing I alluded to but didn't mention in my previous post... even though Archie Comics does have its independent storyline with all of these characters they created, Sally included, note that everything they do still has to be approved by Sega. Which is why I think, and most people probably would agree, that for that reason alone, Sonic and Sally would never get together as a couple. It will only be if Sega allows it, and considering their current spin on Amy still having an infatuation for the blue 'hog, it probably never will be.
Sonic just didn't cut off the lights. He destroyed the main generator, and later the back-up, which powered all of his factories. That was a big, albeit, temporary setback for Robotnik... one that gave the Freedom Fighters more time to prepare for what came next.
And thank goodness to that. I'd shudder to see anything resembling the 'black sheep' of the Mario gaming legacy.