No, Sonic didn't try using the Chaos Emeralds to go back, mainly because whenever he's actually got his hands on them, he's fighting Eggman and they scatter right after. So, he's never had his hands on them for long enough when he's not in the middle of something else. Really sorry that I didn't make that clearer.
I just started watching this, I like it. Especially the images together with the details. I know it's been months, but when is the next video coming out?
This series is my Subscriber Milestone Series. So, the next chapter will be coming out after I hit 3000 subs. This is because all of the art is commissioned and only used for that one chapter, and that's expensive.