Yeah it's weird I've thought the same thing. Esp when it's just inches you fall forward into a gap - just look at Brady who has 1/100th the strength and athleticism of Josh, but has been automatic his whole career regardless what the OL was. Unfortunately against the Titans there was no gap where he went. Contrary to popular opinion, he didn't miss the sneak because he slipped or someone missed an assignment on the OL, he "slipped" after the Titans DT lined up in the exact gap they had run the sneak a number of times previous, and Dawkins had no chance to get any leverage to move the DT - he was already there and Josh ran right into him. It seems more art than science (or brute strngth) - get up, snap quick, and recognize and get low and lean forward into the right gap. No idea why they seem to have taken it out of the playbook.