"What kind of explosion does (Spence) have versus Khalil Mack, who lit it up here (at the combine), and Von Miller, who lit it up here, and then lit up the NFL? His 35-inch (vertical) was in the ballpark, but his broad jump hasn't been, and I thought his 40 was disappointing," said NFL Media draft expert Mike Mayock on NFL Network. "4.8? I thought he'd be somewhere between 4.65 and 4.7. It will be interesting to see if he can improve that."