I love the idea of trading for or signing a solid OG but...
Mathis is 33 going on 34, coming off of a major knee injury. And as Sciz says he's making $5.5 mil. That's up there for a Guard. And he's "expressed displeasure" in his contract. In other words he wants a raise, maybe an extension too. No way do I give a 33/34 year old anything coming off a knee injury any kinds of salary guarantees or bonus we're going to have amortize for a few years.
One more thing. He may have been as good or better than Mankins...once upon a time. But I'd be really surprised if he's near that now. Unless someone means the 2014 version of Mankins.