I was initially thinking the same thing when I saw all 3 OL block down, but I think it looks that way mostly because of the way the Dline on that side lined up and sold out into the gap Josh was going. It looks like Dawkins is blocking down, but I think it is also Dawkins just trying to make contact basically after the DE who is lined up so far inside just beats him to the spot - Dawkins lost any chance of leverage at the snap. Josh looks totally focused on just that gap - there really isn't any "dance" when you look from above - he takes a step to the left to hit the gap and the DE is already there.
Others have said the right side was avail - regardless of what happens on that side - Williams pusing behind Morse (and what is Brown doing just running to the pile instead of blocking the guy from the right - thinking he coud push the pile from behind?) Josh looks totally committed to just that gap. The DE lined up and exploded right exactly into the gap Josh had chosen. I think it does come down to the Titans knowing the tendency and just selling out for it and being in the exact right spot.