FRISCO - Cowboys tight end Rico Gathers has always looked up to Jason Witten.Gathers watched the future Hall of Famer on the field as a rookie, trying to understand how a Pro Bowl tight end operated in the pass and run game.The two talked football sparingly but family more, Gathers said from minicamp Tuesday, as the two tight ends also raising children.And then Witten wrote Gathers a letter."Rico," it began on Witten's personalized stationary.LOVE HAVING YOU AS A TEAMMATE.