Assuming Kaz would have his grab and shield buttons turned into attack buttons to emulate Tekken's limb system, how would he grab and shield?
For Grab, it would be using a Combination of Certain Attack buttons, typically a Punch and Kick button.
For Shield, Tekken character can block by just Standing still, though only Stand block. They also could somehow find a way to make it to where if you hold back as an attack comes, you can block it
To be honest, maybe they might not do this and instead have some sort of way to incorporate all the Attacks into just 2 Attacks Buttons. There's also inputs and states to put the attacks in. On the topic of throws, Kazuya actually had 5 throws shown, which means at least one of those throws are inputs