>>81512788
>>81520027
If you play kick the groin game, then you are no less vulnerable to counter kick into groin yourself when you try to kick into guard, simple geometry. If you leg reached his groin, so is opponents legs reach you. If you are amateur you are literally playing into trap of BJJ fighter who looks vulnerable in this position.

There are banned moves that shift balance against grapplers defending from the ground like downard elbow strikes, side soccer strikes to ribs, stomp face kicks, but groin kicks aren't them.