And how do you match that with Meikyo Shisui? You made the button give you the last one already?
Apart from that I don't know too much about Samurai cause I levelled it unenthusiastically and then stored.
But take for example Ninja, with that system you'd be only saving up one slot, since you'd only put together Spinning Edge and Gut Slash. Same thing for Paladin's dps combo (at least from where I'm at, not sure if it gets more complicated after 65).