So it guard breaks only in Mugen when the opponent doesn't barrier block, or it guard breaks in or out of Mugen when the opponent doesn't barrier block?
Welcome back, Lunar.
Is 22D still unblockable? I've only seen it used a couple of times and it looked like it was blocked. Unless they're releasing it early or it wasn't the D version at all. Sometimes it hard to tell on little Youtube videos.
I really wish I could help you. I want to know a way to win defensively. All of my buttons are mapped to lose so all I can really do is sit back and defend.