Four first round picks are still unsigned; All share an agent

According to Pro Football Talk’s Mike Florio, four first-round picks remain without deals:
Chargers defensive end Joey Bosa (No. 3 overall), Jets linebacker Darron Lee (No. 20 overall), Texans receiver Will Fuller (No. 21 overall), and 49ers offensive lineman Joshua Garnett (No. 28 overall), in which all four unsigned players are represented by CAA.
This is an interesting concept, especially since almost every other players deal has been signed.
I wonder what they are waiting for?

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