Two reasons you don't take a ILB with a high pick in round 1:
No need to spend a high 1st round pick on an ILB or 4-3 LB. Their are future pro-bowlers are these positions in the 2nd round and beyond.
Bobby Wagner, MLB, Seattle. After starting the year with Wagner in a two-down role (the Seahawks initially took him out on passing downs), Seattle realized by Week 5 this was a waste of his all-round ability. Since then he's missed only six snaps, excepting when he was allowed to rest during garbage time of the recent blowouts of Arizona and Buffalo.
His primary job, though, is still run defense, and in that regard he couldn't have done better than his first ranked position in run-stop percentage (a metric that looks at tackles made in the running game that constitute a defeat for the offense), edging Derrick Johnson and NaVorro Bowman among middle linebackers.
He has not been outstanding in coverage, but has made few major errors and never looks out of place. His 0.88 yards allowed per coverage snap through Week 15 ranks him 21st among 48 qualifying inside linebackers, and while he has allowed two touchdowns he has also made three interceptions. Detractors may point to him being quieter in the last half of the season (the Arizona game aside), but he's never played poorly.
Read More: http://sportsillustrated.cnn.com/nfl/news/20121224/peter-king-monday-morning-quarterback-week-16/#ixzz2GHYJQNsy
Lavonte David, OLB, Tampa Bay. A full-time starter from day one, David hasn't missed a single snap since Week 6. Like Wagner, he also leads his position (4-3 outside linebackers) in run stop percentage and has a particular penchant for making tackles for loss, where his 17, not including sacks, leads the league, just ahead of J.J. Watt. The bottom line here is that he is a very high quality run defender who loves to attack. Like Wagner, his coverage skills are average. However, he has allowed five touchdowns while picking up only one interception, which doesn't stand in his favor.
Another difference is that David is used to blitz much more frequently (23 percent of passing plays compared to 10 percent for Wagner) and while he has at least hurried the quarterback 18 times, statistically this isn't a good reward for 143 blitzes.
Read More: http://sportsillustrated.cnn.com/nfl/news/20121224/peter-king-monday-morning-quarterback-week-16/#ixzz2GHYVxdaD