The order of your form skills will determine what Blitz attack you will get, judging from the footage given to us - rather than depend on the number of Sen you have like SAM. That is the major difference between it and Iaijutsu/Ninjutsu.

E.g. from the demo, we know that Opo-opo -> Raptor -> Coeurl gives us Rising Phoenix, whereas Opo-opo three times gives us Elixir Field.