The Mavericks swapped out big men Friday morning, signing Jameel Warney and waiving Brandon Ashley.Staff members have kept close tabs on Warney, who was with the Mavericks last preseason and spent 44 games with the Texas Legends of the G-League in 2016-17.The 6-8, 260-pounder from Stony Brook, where he averaged 19.8 points and 10.8 rebounds as a senior.