We have more than enough moves to learn:
> 3 base variations per character with their unique moves and combos
> 5 krushing blows per character; every krushing blow has its own requirements
> God knows how many brutalities per character; again every brutality has its own requirements
> At least 2 fatalities for every character; there might be even more, judging from the fact that the customization system allows you to select 2 fatalities per variation (out of how many?) Stage fatalities, if any, will require different inputs
> A completely new fighting engine as a whole
So, do we need a complicated amplification system? Hell, no!
BTW, I'm not necessarily supporting the block-to-amplify idea, but I'm definitely demanding an universal input for all characters or at least an universal command for each character's entire moveset.