Except it seems sort of ridiculous when GSP has landed the kick, effectively and powerfully, at the highest level of combat competition. Perfect form isn't everything in MMA - effectiveness is.
But yep lots of fighters practice a ton of disciplines, one I've been surprised to learn most fighters practice is Capoeira. Alves, Anderson Silva, Junior dos Santos etc all practice it.
true, but why shouldnt he learn the proper technique? he can learn it with joe, so being a smart fighter he took advantage of the opportunity
there is a difference between landing the kick pretty well, and being a threat with it
Siver > GSP
AS teepercut > teep
if he really learned it well GSP could be doing that thing he never does anymore and actually finish some fights with a HL reel move
...shields is the perfect guy to test it on