Outside of the first three picks, this is the most popular mock draft selection. This is a perfect example of talent meeting need for the Eagles. If Kuechly is on the board, it would be an upset if they didn't go this direction.
SB Nation's Bleeding Green Nation explains the pick:
Now that the Eagles have traded for DeMeco Ryans, every mock drafter on the planet has seemingly checked linebacker off the list for the Eagles and moved on. Not me. If you watched the Eagles at all last season, you'd know their problems at LB were more than just the man in the middle. In reality, the Eagles could probably use an upgrade at all three spots. So for me, Ryans is just the start of the overhaul. The chance to add a guy like Kuechly here is just too good to pass up and in the course of one offseason could turn this teams' biggest weakness into one of its most talented units.
While Kuechly is most often projected at middle linebacker, he really played all over the place at BC, so I see no reason why he couldn't slide over to SAM with Ryans next to him at MIKE.
Luke Kuechly 2012 NFL Draft Profile (via sbnnfl)