The downside of the JNT is opposed to the Darce is if you lose the leg you lose the submission. I have decent success using my free leg to get my stuck leg out and then trying to recover guard. Especially since you know the guy has a vice and you're ready to try and get your leg out if he dives, it often turns into a scramble in my experience.
So in a really sweaty MMA type scenario I would think a savy guy could escape his leg unless you had it locked up really well.
So in a really sweaty MMA type scenario I would think a savy guy could escape his leg unless you had it locked up really well.