I been playing Strider for a long time and just realized this.
Summon Formation B = Normal Cancelable
Shot Formation B = Normal and Special Cancelable
However, the special moves are limited to only
Ame-no-Murakumo L, M, H
Gram L, M, H
This means when you do any of these two moves, you can cancel it anytime as long as you have an orb out.
This is similar to Zero's level 3 buster. But instead of all special moves, it is limited to two.
This actually gives Ame-no-Murakumo a purpose.
You can use the forward momentum from Ame-no-Murakumo to close in on your opponent but cancel it into Shot Formation B before the slash comes out.
You can also freely fish out Gram M and Gram H and cancel it into Shot Formation B if you notice that it will not hit anything.
You can also do things like do a special move, bait a punish, and then cancel into Shot Formation B.
This is what I came up with from the top of my head but I am pretty sure you can do a lot more things with this.
Anyways. For those who don't know, Gram and Ame-no-Murakumo can be canceled! So please use it.