I AM HIM. (took me 20+ hours)
This is the hardest rotation in the game. Period.
After many, MANY restarts... I have finally managed to clear this flawlessly.
Calcharo Changli is a strong combo, that should not be ignored.
I would strongly advise against attempting to pull off this specific rotation. It requires an absolutely ludicrous amount of speed, mechanical ability, reaction time, Boss AI manipulation, multi resource management and swap order planning.
However, despite my extremely mediocre echoes, I have managed to clear this at an extremely fast time for my investment level. I am very satisfied with this clear and will rest for now till the next ToA. My broken wrist and fingers need medical care.
Music is by Punishing Gray Raven - "Burning Vow"