Though I would love to see the Lion's trade down in the 1st round and acquire more talent, especially since there are 2 guys rated about the same in multiple positions of need, I just don't see it.
However, I do think that being at the top of the 2nd, 3rd, and 4th rounds makes those slots VERY valuable to other teams and fodder for trading. Think of the Shonne Green deal of last year. I also think that picking up all the 7th rounders gives us a little bit of extra deal making leverage. And not having 5th and 6th round picks, I can see some swaps to get in these rounds as well.
I think the best chance of moving around would be with the Pats who have a ton of 2nd round picks to trade and if they saw a guy they wanted up at the top on Friday, they would move up to get them.