They need to add countering ground strikes into submissions for some fighters...the good submission fighters in particular. This was in UD3 and added a whole new layer of strategy for/against good ground guys. You had to be very careful not to go to crazy with your gnp against certain fighters like Big Nog or Maia, cuz being postured up didn't mean you were safe from their submissions. If you were in their guard or half guard, you had to be wary of submissions at all times. But I feel like this could be done through the grapple strike countering system too. Just like you flick the stick left/right to arm trap, instead you would hold down the submission modifier(L2/LT) and flick the stick left/right to counter the strike into a submission attempt.