I listened to this song a few years ago, and I got Sonic Generations for the first time the other day, so I heard the Perfect Chaos theme and went “ohhhhhhh”
You forgot the part in the first part in knuckles its actually lava reef zone, and if you listen to the beat in the emotional part, it has the ice cap zone beat, and after ice cap zone, you can hear Giorno's theme from Jojo's bizarre Adventure, and switches to Unknown from me.
Nah, I'm a FNF fan (kinda) and this soundtrack of Sonic 2 (Tiger) sucks like all... But I have to admit that if you slow down the video to a speed of x0.5 there is an improvement