Everyone is talking about the missed subs by GSP so I am definitely going to catch this fight sometime. Grissim is dead on about the armbar. I hate guys that intentionally use their cup, a good BJJ player can escape if you play the slot machine and the technique I use is I grab my own shoulder in MMA and No Gi when falling back for the armbar. I get taps before I hit the ground as well.
The kimura is a submission of inches and angles (I guess all subs are to some degree). Hip out a little and it is a different feel. Bend the elbow a little more and it is different. But once it is in the right position I have never been able to muscle out of one. It always seems that we do kimura practice on days when I work my shoulders, not sure why that is
What we think, or what we know, or what we believe, is in the end, of little consequence. The only thing of consequence is what we do. -John Ruskin