He may very well end up there some, but Barnes is NOT a 4, not even close. He's a 2/3 in a 6'8 body. Very smooth, very quick, but McDermott was better around (his back to) the basket then Barnes was. He's not a low block player. He still wouldn't play in the low post. But literally the only other players above 6'5" are Reggie Bullock who definitely isn't an option at the four and I guess the 6'6" Will Graves might see time there, too. They will be effectively playing four guards for much of the games, but Barnes will probably have to guard some 4's.