6'4" and 260 pounds is an excellent frame within which to build upon. It's much easier upon the athlete to put pounds on vis-à-vis muscle, rather than take pounds off. The athlete generally retains their quickness this way, and the footwork is easier to teach.
Think Gary Patterson's model at TCU. He regularly recruited guys around the 6"3 and 235-240 model coming out of high school. Red-shirted the first year, built them into monster defenders with quickness on the outside, and voila!
It's very rare to get an Oliver. We haven't had one like him since Leonard Mitchell, and before him Wilson Whitley. This kid will be red-shirted and built up for college ball. That's the way you build the line, offense or defense.