Steelers could trade down I think if they do not like what they have to pick from...
Patriots could easily trade up if they really want one of those safeties either Nelson or Landry...
Lions have a lot of draft selections, some they do not need so they might trade a few of those. In terms of 1st round, not getting Thomas, well I do not see a down side in if they got Thomas, who wouldn't want a rock OT like him...
Really though it is all about how badly teams want a certain player early in the draft, I see that kind of attention being created by players like Reggie Nelson, Ted Ginn, Adrian Peterson, Patrick Willis, Amobi Okoye, and LaRon Landry. Of course in the later rounds their are players that create trades as well, but most of it starts from the top, and once a few picks change hands it can change the entire draft board and who is avaliable.
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