CB is not the deepest position in the draft. There is a huge gap between the top 3-4 and the rest. Those top 3-4 are LEGIT #1 corners. The rest are likely going to top out as #2s. The Pats have 3 guys already fitting that bill in the Jones "Triplets". They need that #1 corner. Someone who can stay with a Diggs, a Metcalf, an AJ Brown.
I honestly don't see him taking a safety. If he takes one at all, it will be later in the draft.
There are a slew of mid-round WR and TE that fit the Pats billing. That's why I don't see the Pats using a pick there early on.