for some of them it could be a boost to their game but for most of them it is way too late. they are specialists in brazilian jiu jitsu their entirce carreers., they are ground fighters. not all round grapplers.
they are not all round grapplers like khabib/islam/tsarukyan/jones etce. those guys can grapple wherever (or never get put on their back). be it standing, scrambling, on the ground from bottom or top. how may times have we seen bjj fighters drop to their ass in hope that the fighter would follow them? or pull guard because they cant even get a hold of the opponent? that looks so incredibly weak to me. that shows that their game is severely lacking
the myth that bjj-fighters are the best grapplers is just that......a myth.
I'm an upper belt in BJJ and do judo and wrestling, and I've argued forever now against the culture of "sport BJJ" not being good for MMA or the growth of BJJ in general. I agree too that it is a myth that BJJ fighters are the best grapplers on the planet. The thing with all those Daegastani/Eastern European grapplers is that they are basically training all aspects of grappling you need for MMA from an early age. They're getting the lower and upper body takedowns from wrestling, upper body takedowns/throws/trips against the cage from judo, balance and upright striking posture from judo (judo gripping is very similar to striking), and submissions/leglocks/basic ground grappling from Sambo (or Judo). Most of them aren't training traditional BJJ, yet they're becoming champions in MMA.
Meanwhile, you have BJJ guys wasting years splitting time between GI BJJ (completely impractical for MMA) and No-GI BJJ, and learning a ton of moves that will never be applicable to MMA. In MMA grappling, punches and the lack of a gi change so much of BJJ that it basically doesn't resemble traditional sport BJJ. Example: In a BJJ comp, if you stand back up and disengage from inside someone's guard, you may be penalized. In MMA, its fine. Most guard passes in BJJ are about as basic as it gets, nothing super fancy. Maybe just stepping the leg over or MAYBE a low knee cut. Leglocks and entanglements are super low percentage because they put you in a bad position, and most of the fancy guards like x guard, de la riva, or single leg x are gone because its hard to keep a grip on your opponent or they just disengage or punch you from top.
You're much more likely to see a D1 wrestler develop some hands or a striker develop some takedown defense to become champion in the UFC, then you are a BJJ person who either has to develop elite hands or elite takedowns because they have a ton more gaps to fill in their game. It takes YEARs to get good at wrestling. Wrestling and Judo take much longer to pick up the basics than BJJ. I suspect that has something to do with it too. Its not just takedowns with wrestling, but its the distance, hand fighting, clinching, scrambles, and chaining together a bunch of moves. Some of that could happen in BJJ, but it loses a lot of it because of the ruleset disincentivizing it. There's also no sense of urgency in BJJ either compared to Wrestling or Judo. Its hard to break out of that mindset when you have time to work from a bad position. In wrestling or judo, if you get put in a bad position or thrown/taken down, you usually lose the match instantly.
Have you ever been to a BJJ tournament?
It’s not that people are not teaching or drilling takedowns, it’s that more that sitting guard is a better option than shooting wild for takedowns. You see that more and more when higher belts compete.
It would need a rule change, like sitting would be minus points or takedowns valued much more than two points. Modern sport BJJ is a totally different sport and only a few do it because they want to be good at MMA or even think that they would ever have an mma fight.
It goes both ways, most wrestlers have very poor submission technique, they mainly force and crank, use so much energy and are clumsy in transitions or lack transitions from one sub to an another. One could think they don’t train submissions at all, just watch UFC and try to do what others did.
^^^This. Any guard pull should be negative points in BJJ. The other issue is over reliance of leglocks in sport BJJ, especially at the upper belt ranks. Its hard to just pass another upper belt's guard, so you have to be unorthodox. A lot of guys will just pull guard to get on a leg and go for leglocks which a lot of people still haven't trained to defend. Its the path to a quicker win, but its also something you'd never do in MMA because it puts you in a bad position.