I think this is probably right, though I don't know that they weren't prepared as much as they could be. The other deal obviously fell through, and Jerry didn't think Floyd was the guy. Are we sure (well, internet "sure" anyway) that it was Floyd that Ciskowski wanted? Are we sure that Garrett and/or Ciskowski didn't want Eifert? There was a lot of smoke on that name, so I wonder if he wasn't the top guy for either Garrett or Ciskowski at that point.
I agree with your point about Jerry not getting too cute. There probably was an opportunity to bail on the first completely for a team trying to get back in, and given the unprecedented run on offensive linemen, who knows what would be left if we traded down further.
We got a starter for the interior of the oline and picked up a third. That's acceptable.