Roberts, at 270 pounds, isn’t a speedy tight end like Ebron in the passing game. He won’t split out much, and will spend a lot of his time blocking in line. But that doesn’t mean he can’t catch either. Matter of fact, he does it well, hauling in 45 passes with only a couple drops last year. Buyers are circling Oct. 8 on their calendars, as all eyes will be on that Sunday’s Cowboys Packers air war. Last year’s Dallas…