If you really look at it, it wasn't that steep of a price to move up.
To go up from #48 to #37, the majority of the cost was trading away #98 outright (the compensatory pick).
The lesser cost was swapping #135 for #143.
The real question is whether the trade up was necessary to get their guy. Could they have remained at #48 and still landed Savaiinaea, or an equivalent talent? We'll likely never know.
My guess is that Grier/McDaniel had enough intel to suggest to them that they needed to make the move. So I don't have an issue with it. Although it does suck not having that 3rd rounder now. There are a few players I like that I don't believe will be available at the Dolphins next selection, #116.