You're likely right on Queen although they have been flirting with a super big safety for years (didn't they really look into Su'a Cravens in the draft? Then there are the corpses of Tank Williams, John Lynch, Adrian Wilson, Barrnett and the weird use of guys like Eric Alexander in random games).I think that is a separate evaluation. There are 2 evaluations in a draft pick trade:
1. Did you increase the chances of getting value
2. Did you execute the picks in a way that got you value.
I mean, there is no way to know who they would have picked at 23, the 3 guys you listed may well not have been at the top of their board (I bet Queen wasn't on it at all, Bill never picks LBs that small). I feel pretty confident that the average performance of picks say 37-45 and 71-78 will be better than the aggregate performance of 23-31. Now choosing the right guys within that slot is a separate analysis.
I don't think it's a separate question because your projections on what kind of players are available in the mid 30s and the early 70s. If your evaluation of the draft board is that the talent is so bad that you should take a special teams role player early in the 3rd because that does fit a game day need and there's no one else who can help the team more, well then maybe you shouldn't drop down in the first place so you make sure that you don't lose someone you really like between 23 and 37 when the Lions/Dolphins/Titans and their NE style organizations are also picking.
I have almost total faith in BB so I'm not too worried--I strongly suspect he doesn't see a material difference between Murray and, oh, Willie Gay (or Ruiz and Jonah Jackson) and he is going to add a bunch of potentially pretty useful players in rounds 2-4 and planned the trades accordingly--but I do want to see how it plays out.