Look, hindsight on this is clear, but if Smith and Castonzo are equal on your board, with a dropoff thereafter, you look at the gap and decide how worried you are that your guys aren't available.
If we'd decided we were going OT, it seems reasonable that our guys would have concluded Smith and Castonzo were BOTH likely to be gone by that point.
As it turned out, that didn't happen but I don't fault them for their educated guess. I would have vastly preferred Castonzo and 49, but what are you going to do?