Only thing that worries me is blocking sub attempts. Apparently you hit R1 and Up on the right stick? What is the normal transition block input? Isn't it just Up on the right stick?
And if that's the case, that would mean a different input is required to deny sub attempts from any other transition. So how are we to be alerted differently that they are attempting a sub and not a transition? I'm sure the controller rumbles to alert you like EA MMA, but are we just relying on the visual que? Cuz if so, that worries me. In the Rousey-Tate gameplay video, it's a very quick and subtle arm grab that initiates the sub. How are we supposed to react to that different than a basic grapple block?
Unless all grapple blocks are R1 and up, then ok.