Here is a great piece on Tony with a great message. There is also a great shot of the detrimental effects his of heel striking with a high profile cushy shoe like the Hoka (no wonder he has his knees taped).
To see this GO to the 2:13 time on the video and watch the guy with the big hair, wearing the Buff emerge in the center of the screen as he runs towards you. Watch very closely to his biomechanics, specifically how his knees jet out to the side on each "crash" landing stride. Watch it over and over to really see it and add your comments.