You're not really referring to the Henderson fight are you? Come on Khov, that leg lock wasn't anywhere near close.
The thing is, leg-locks aren't just for submitting. He could have leglocked GSP then taken his back, went for an ankle, got side-control... any of those things would have landed GSP in a world of hurt and the leg lock was effective against Henderson at stopping the assault.
Shields' had GSP locked up really well in the few seconds it was on the ground. I wasn't sure if Shields could submit GSP but I'm sure he could now. Plus I'm glad Shields' cardio was proven again.