This.
And when he doesn't want to go to the ground, or his opponents don't fear going to the ground with him, his striking is nowhere near as effective. Recall his fight with Jake Shields. (who is not, BY ANY PROFESSIONAL STANDARDS, a good striker.)
He BARELY outstruck Jake, and it wasn't, by any means, definitive.
http://blog.fightmetric.com/2011/05/st-pierre-vs-shields-official-ufc.html
I'm sure Hendricks isnt going to rely on eye pokes so your theory goes out the window.