I'm one of Jamar Chaney's biggest supporters. He can play all three linebacker positions and has the elite physical tools—size, speed, instincts, tackling, etc.—to be an above-average linebacker.
The Eagles will more than likely play all three stud corners on the field, leaving Chaney and most likely Casey Matthews as the second line of defense.
When the Eagles have their nickel package on the field, teams will obviously look to run more. Since Matthews seemingly cannot get off a block, Chaney will have to be the impact, run-stuffing linebacker.
Chaney had 16 tackles in his first career start last year against the Giants, so his run-supporting capabilities are there.
Chaney is expected to play on the strong-side, meaning he will go against athletic tight ends such as Vernon Davis, Jason Witten, Zach Miller and Dustin Keller this year. The tight end has killed the Eagles these past few years, so hopefully Chaney reverses the fortune.
If the Eagles end up facing the Packers in the playoffs, Chaney will have to go against a freak of an athlete in Jermichael Finley, who can single-handedly destroy the opposing team's secondary.