Some strange Sonic CD sprites Mega Drive Developers Collective

I've wondered about this for months at this point and never came to a clear conclusion about these sprites. I'm specifically talking about the angled

Sonic the Hedgehog CD/Hidden content - Sonic Retro

Sonic CD Sprite Sheets – Sega Genesis - Sonic Galaxy.net

Sonic.EXE - The Demon (Sonic 1 Prototype Hack) -Release Trailer

Sonic CD's Mysterious Cut R2 Level Discussion - Post Origins

Sonic the Hedgehog CD/Hidden content - Sonic Retro

Sonic CD Sprite Sheets – Sega Genesis - Sonic Galaxy.net

Sonic CD Sprite Sheets – Sega Genesis - Sonic Galaxy.net

Sonic CD Sprite Sheets – Sega Genesis - Sonic Galaxy.net

Genesis / 32X / SCD - Sonic the Hedgehog CD (Sega CD) - Wacky

People can't reconcile SONIC CD happening between 1 & 2 because

Sonic X-treme, Sonic Wiki Zone

Some strange Sonic CD sprites Mega Drive Developers Collective

Discussion & Research Mega Drive Developers Collective

Sonic CD's Mysterious Cut R2 Level Discussion - Post Origins