So all DE's rush from the outside? What about stunt rushes when the DE crashes in? Can Brown, Smith, or Armstead withstand a bull rush from a player like Demarcus Ware? Say the guards are tied up with blocks and one of those 3 LT's are forced to make that block... There's more to it than just the DE's rushing the outside. "Stepping up" in the pocket won't save a QB from a successful DE rush every play.
That NEVER happens.
There are many things you can do to help out your tackles against proficient pass rushers. You can chip, run screens, delays and traps, quick throws, move the entire pocket etc. That's what imaginative play callers do, and we happen to have one.
What we need is someone to stay healthy that knows the offense and can carry out assignments. The o-line is a unit, and it's more about working as a unit than one on one match ups.