“In the course of the match Mr. St. Pierre scored with numerous sophisticated grappling techniques, takedowns, pins, guard passes etc. Lubricant doesn’t discriminate,” wrote Danaher. “If lubricant made Penn’s grappling ineffective, it should have also made St. Pierre’s grappling technique ineffective.”
If it was on his back / shoulders.
There was clearly video of Penn not being able to keep his guard high on GSP's back where the vasoline was applied. This making his flexibility (a huge weapon of his) ineffective.