Much is being asked of Martellus Bennett

The Cowboys have tested Martellus Bennett's mental capacity this off-season. That's because he has the potential to be an impact player. Bennett believes that the Cowboys he forms the best tight end tandem in the league with perennial Pro Bowler Jason Witten. It's a point that's tough to argue against, and the Cowboys are determined to take advantage of their talent. The Cowboys intend to put the two tight ends on the field together often -- and give defenses all sorts of different looks out of what is traditionally a run-oriented personnel grouping. Witten, a heady veteran, is comfortable lining up as a tight end, slot receiver, wideout, H-back or fullback. Bennett, who has never played in the backfield, is being asked to learn all those roles. "There's been a whole bunch of new stuff," said Bennett, whose 60-yard gain on a seam route was the highlight of today's practice. "It's like learning two new positions all over again. It's b...