A proper O line has nothing to do with Watson struggling when blitzed. 5 can't block 6. Even when he sees the blitz coming, he seemingly doesn't know what to do with the ball.
1 yand line.. texans might not punch it in.. Bob going to call a pass from the shotgun. Fuller hirt.. uh oh..
A lot of it is on Watson simply not seeing blitzes. The O line can't block 6 with 5, no O line can do so consistently.