So I decided to replay one of my favorite Classic Sonic games, "Sonic Pocket Adventure", and I found something rather interesting.
The use of the Sonic Jam model seems more appropriate in this map pack due to these reasons:
Well, we know the Walls of the Void will bridge the classic games with the modern games, so, why not use the adventure model? Well, the answer now lies in these pictures:
As I was replaying Sonic Pocket Adventure, I noticed it was another one of those games with the storyline all messed up. (for example Sonic Battle, it takes place after Shadow the Hedgehog, yet was released after Sonic Adventure 2). Well this game was released after Sonic Adventure, but connects the classics with the modern. To show that Sonic from Pocket Adventure was before adventure, look at the way sonic looks:
Sonic in Sonic Jam:
Sonic in Sonic Pocket Adventure:
Comparison of models to sprites:
Look pretty similar huh? And now here is the most interesting part. Eggman's switch in uniform. At the beginning of the game, he wears his normal outfit:
But, when entering the Gigantic Angel (Eggman's new battleship), we see a change in outfit:
This now means that the Walls of the Void takes place during Sonic Pocket Adventure, in a new timeline that was created by the events in Sonic Generations. (The reason how a new timeline was created will be explained by the Doctor in a cutscene, and will have a similar idea to that of Back To the Future, but different.)