No, Zero's temp invinciblity is NOT a game feature. I've mentioned it in my previous post. It is called Damage-Barrier, a barrier generated by Zero's armor when it recieves damage.

You've misunderstood what a D-Converter is. It converts the damage ZERO's take FROM Sonic into weapon/Gaia energy for ZERO.

Shock Buffer reduces stun period from any kind of attack. (It is one of the "parts" in MMX6)