Unfortunately 8KK~BT PP4PP7K never works on Super Heavyweights no matter how much stun there is (Do 8K~PP6PK instead). 4P2K not connecting after some juggles is an annoying quirk of 5U's stupid invincibility frames. Also If I'm not mistaken, 214T does more damage to Super Heavyweights than the average 64T juggle. This match was kinda Lol though.
At 0:08 to 0:12, that's not a mid to low mix up lol. Rachel held high from being hit with BTP+KP, which is a natural combo (that hardly anyone realizes) because she's trying to hold the highs, unaware that you cannot.
64T > BT4P > BTPP4PP7K does not hit confirm on super heavyweights. BT4P+KP is i15 frames after a blocked neutral P, not wise and definitely not optimal when characters have faster strikes up close. A lot more I can point out but I won't.