I could see Caserio bringing back Nelson and bringing home Diggs in FA as well as drafting a CB in rd 3 or 4 if he doesn't pick a CB at1-23. A lot of this depends on what happens in the rest of FA.The Texans currently have 7 CBs on the roster:
Stingley
Okudah
King
Mike Ford
Ka'Dar Hollman
D'Angelo Ross
Tony Pride
It's safe to assume they will add to this group, and probably within the 1st 3 rounds. I think every CB in the draft not named Quinyon Mitchell and Terrion Arnold will be available to the Texans at some point in the draft. Could be a 25% chance that the Texans take a CB with their 1st pick, wherever that might be.
I was going to do a post FA/Combine mock, but I want to see how Caserio finishes up FA before I do a new mock.