Does Sonic Adventure 3 Already Exist?

Which Sonic game is the true Sonic Adventure 3? That's a great question. I have a better one though. When did I ask?

MY TWITTER:
https://twitter.com/LukeStation_

TIMESTAMPS:
0:00 Which Sonic game really is SA3?
1:10 Comparing '06 to SA2
3:22 Why would '06 be Sonic Adventure 3?

MUSIC:
Open Your Heart - Sonic Adventure [https://www.youtube.com/watch?v=4fo__Sh0nIg]
High Tech Tower Earth Building - Lupin III Farewell To Nostradamus [https://www.youtube.com/watch?v=GOgVUmEvc8A]
2-Player Select - SA2: Battle [https://www.youtube.com/watch?v=1gIxuYuI3IQ]
Welcome to Station Square - Sonic Adventure [https://www.youtube.com/watch?v=dWbSg0VOSgg]
Main Menu - Kirby Battle Royale [https://www.youtube.com/watch?v=kJYWZbtMqwQ]
Bowser Jr's Mad - Mario Party 9 [https://www.youtube.com/watch?v=1N5eu__k2aM]
Flower Mountain Canyon - Spark the Electric Jester [https://www.youtube.com/watch?v=MEojs3W-pEQ]
Tornado Defense - Sonic Unleashed [https://www.youtube.com/watch?v=NyUmp4FGMkU]

Footage from FCPlaythroughs unless stated otherwise
Sonic Adventure 3 logo by Sonicguru with permission! :)