I mostly lurk on the board for news, but Quinn is my top player and I'm in ACC country. I'm a Terps fan.
His combine wasn't that good.
He's up near the top of many draft boards because of his play in the ACC. It's not a situation where he's rising. He was always there but guys like Fairley and Bowers are falling.
If you haven't seen him play, Youtube has UNC vs Virginia, Boston College, Florida St, and Pittsburgh. You can watch and form your own opinion rather than use a draft guide's. On every single snap he's playing in the opponent's backfield.
He's not without flaw, but he's a rare prospect. If you broke down Ware coming out as a senior, his production was less than what Quinn was doing as a sophomore and it was vs Sun Belt teams. The draft guides also had plenty of similar negatives on Ware.
If Washington takes him, it's going to be a bad decade. I think he goes 7th to San Francisco, so technically not top 5, but he could go to Arizona or Cleveland instead. If he's there at 9 and Dallas took him, I'd be pretty thrilled.
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Side note -- good stuff in your sig's mock draft. Carimi is my top OT, especially like Rackley, and Ballard is the most unique WR I can remember seeing since Randy Moss.