The Sonic 4 series didn't begin development as Sonic 4. It was originally going to be a series of generic 2D Sonic game to test the waters of the digital market. I guess midway through development, Sega and Dimps became overconfident and decided to market the game as Sonic 4. Which poses the question of what Sonic 4 would've been like had it been intended to be Sonic 4 from the very beginning. I propose that once this "saga" is over, Sega pulls a New Super Mario Bros. Wii and creates a retail version of Sonic 4 that borrows elements that worked in the episodic Sonic 4 while making a whole new game at the same time. The Episode 2 levels would have new layouts that don't force the player to use the tag-team moves, there would be a huge reduction of springs and speed boosters, and there would be minor cosmetic changes too such as the classic character designs. The music would also use real instruments and not some shoddy imitation of the Genesis sound chip.