Many rules have been a bone of contention in MMA circles as they can vary across promotions. For instance, the UFC doesn't allow knees to grounded opponents or 12-6 elbows, unlike ONE Championship. On the flip side, moves like eye pokes, groin strikes, and headbutts are banned across all major promotions for obvious safety reasons.
Obeying the rules of the promotion and the commission you're fighting under is very important for fighters. Jon Jones lost to Matt Hamill via DQ because he landed multiple 12-6 elbows and similarly, Petr Yan lost his UFC bantamweight championship for landing an illegal knee on Aljamain Sterling.
Sean O'Malley's coach Tim Welch believes a couple of rules in MMA should change to stop fighters from exploiting them...
Sean O'Malley's Coach Reveals How Aljamain Sterling Exploits A UFC Rule And Wishes To Get It Changed
Welch was asked about the MMA rules he would change on his official YouTube podcast, recently. Right away, he mentioned that fighters should be able to upkick opponents on top of them.
It is worth noting that upkicks from the ground to a standing opponent aren't illegal in the UFC. In fact, Niko Price and Jon Fitch finished their opponents via upkicks in the promotion.
However, it is illegal to upkick an opponent while their knees are down. Back in May 2021, Randa Markos was disqualified for kicking Luana Pinheiro from the ground while the latter's was sitting on the ground.
Charles Oliveira is notorious for landing upkicks too. He threw one at Islam Makhachev that could've knocked the Dagestani fighter out. Even against Tsarukyan, he landed an illegal upkick as the opponent's knees were grounded following which the referee warned "Do Bronxs" and stopped the action temporarily.
Welch, though, believes that the upkicks to a grounded opponent should be legal in the UFC. Another tactic he dislikes is fighters staying in a safe front headlock position to rest up as they cannot be kneed during the time.
Welch called out Sterling for exploiting the grounded fighter rule sometimes and a great example of this is when "Funkmaster" took on Henry Cejudo. During multiple exchanges when Aljo would shoot for a takedown and fail, he would immediately bend his knees, leaving Cejudo with no viable moves.
The upkicks. If some f*****g guy's on top of you, on his knees, whatever, you should be able to upkick him to his f*****g lips. I think that front headlock one too. People shoot into a front headlock and they can hang out there without getting damage and almost rest there. I mean, Aljo does it sometimes but to be able to knee the top of their head, boom, boom, boom, so they can't rest there. So if you shoot in a front headlock, you fail on a shot, you got to pull the half guard and get to your back or you got to make a move. Not just sit in that frontlock thinking I'm safe.