Quite a few of our DE's get caught looking inside and Meredith does not have the wheels to overcome a mistake like that and still be able to chase someone to the corner. That being said, containment is NOT his job. In 2-gap the sun rises and sets with eating blockers and having a uniform push across the line. He does this pretty well. I would love to see him not get beat to the sidelines like everyone else but I would like to see our linebackers doing their jobs too. Full disclosure, last game was definitely an improvement in this regard albeit against Arkansas State.
Unfortunately, Eric Martin is a liability. His aggressive play is great but he runs himself out of the play and only eats a single blocker in doing so. He can get better about not getting too far upfield, etc. but I just don't think he is there right now. This, combined with the DT's not getting much push, leaves a gaping hole for a QB to run through when the coverage is good. Yes, the downside of a 2-gap is that you need a DT that can beat 2 guys consistently and we are lacking that. But "unleashing caveman"(or anybody really) is just not an option without significant scheme revisions.
And that is why Meredith will not lose his job.