Spencer committing to Duke as quickly as he did was an eye-opener for me, as I'd assumed DL would be the room to firm up. That Giants staff didn't get fired because of the defense, and the DC (Patrick Graham) was getting mentioned as a potential HC candidate earlier last year. Coincidentally, Graham also worked with Elko at Richmond, though odds Graham ever returns to college seem approximately zero.
It's too bad Spencer didn't stick with his deal, but losing him to Florida doesn't reflect on Duke the way it might if he'd gone somewhere like Virginia or VT, or even SC. We've already seen ample evidence sought-after coaches want to be part of what Elko building. As with the OL, Duke needs continuity in the DL room more than one season of a hot name, so it's arguably best in the long run to start year 1 of the Elko regime with a leader who's fully bought in.