if wrestling is so dominant... release knees on the ground...
First sprawl, then punish the wrestler with knees...
But the rules are made to...
I think knees to the head of downed fighters will eventually be fully legal. The new rules that start on January 1st 2017 do allow knees and kicks to fighters who arent completely down. So the putting your hand on the mat shit won't work anymore and you can get kneed in the head.
I do agree though that the lack up upkicks, kidney kicks in guard, 12-6 elbows, knees to grounded opponents, and soccer kicks do benefit grapplers.
I'd you fail a takedown and get sprawled on you are in a perfect position to get kneed in the head or soccer kicked. If you got a guy against the cage with your head in his side and he has his back to the cage and you are trying for the takedowns, you are in a perfect position to get elbowed 12-6 in the head. And if back of the head shots were legal and 12-6 elbows you would see a lot of guys getting knocked via elbows to the back of the head.
But thankfully they will now allow kidney kicks in the guard. Which hurts guys in guard and helps the guys on their back. Still though full knees to the head should be legal in time and so will upkicks and 12-6 elbows. Doubt we see soccer kicks anytime though.
Of course there is the flipside. Knees to the head also help wrestlers who are good enough to get the takedown and end up in a north south position or sidemount. Mark Coleman was a beast at knees to the head of grounded opponents as was Kevin Randleman.
Coleman beat Igor via knees to the head after taking Igor down. Of course Igor did beat Mark Kerr via knees to head after a failed takedown but only after Kerr gassed.
And of course Coleman did lose to Cro Cop after failing a takedown getting soccer kicked and then finished with punches. Cro cop also beat huge wrestler Ron Waterman with soccer kicks.
So it depends. Wanderlei beat a lot of people with soccer kicks, stomps or knees after they failed takedowns. And so did Shogun.