I'm wrong at least 75% of the time, but I'd be very surprised to see Davonte Neal at CB. If Kelly and Diaco wanted to reason this way: "Davonte was #5 CB in ratings, and his HS coach said he should be a CB, therefore we really should put him over there", that would have been done pre-Lo's injury --- Lo wasn't ever viewed as some kind of elite lock.
When corner looked ominously unstable, Kelly/Diaco STILL didn't move Davonte, but instead moved two other elite talents [Russell and Shumate]. Why? [If the "he's just too good" argument was making sense to them?] My opinion: Kelly's looked at Davonte and said "wow.... sorry Bob you can't have him".
For the "compromisers": you don't specialize all your time on the offense and step across the line and fill in a little at CB. By definition that scenario means that most of the snaps you field two other Starter CBs. If you have two starter CBs, why steal a super-O player? [Even in practice]. If you're talking only "nickels", then we have safeties to move in instead --- our nickel last year was almost always Gray, Blanton, Smith, Slaughter, and Motta.
I don't get the Neal-to-D theory, but, as said, I'm wrong most of the time.
edit: while I was slow-typing the above, ten million presscon posts came in and the question was answered --- sorry for the too-late comments.
But at least they matched Kelly's decision.