I think it is really hard to predict what Snead will do so far in advance. While we can suspect we know the group of players he might be targeting we can't predict what will happen and if those players will be on the board. Perhaps if Sweat and or Tillery was still an option the trade would never have been made which seems likely to me.
Rockram makes a good point and we know Snead will move up or down based what makes the most sense from a value perspective. If there are 2 players left in his value group and he is 6 picks away he will trade up if he projects those players to be gone when he pick comes. Conversely if there is a large grouping of players of similar value and he can get an extra pick and still get one of his prized players he will trade down.
At a minimum we can understand his moves in hindsight and sometimes even predict what he will do. We are able to do this based on the collective knowledge that is share on this board by so many serious contributors. So thanks to all that participate in such a knowledgeable way.