Yeah, you really gotta read your rival to use jokers trait. At least online. However, I've read a guy and done 3 parries back to back cause he was retarded. I think it's a great way to punish bad strings.
For the guy who asked what to use after ji2 all I do is 2,1 wait for the 2nd hit of 1 to come and use flower. This even gives 1% more than 2,1,2.
As for the teeth I'm sure people will find some stuff. What I've been looking at now is f2,1 because it's an overhead that leads into a untechable knock down. You can do far teeth after and it land right on them, they get up BEFORE the teeth blow up, BUT you can get your crowbar out before they blow up too. So, I've been trying to do f21, far teeth, crowbar. The damage isn't amazing, but f21 is 0 on block and you might be able to get a jump in if they don't block the teeth.
**EDIT**
If you watch the new KH Cat fights you can see how the teeth are used all the time just as a watch the fuck out/make space ability.