Who were the best picks and biggest mistakes of the Ravens’ 20 years of drafts? Columnist Mike Preston will break it down by position over the next week. Today he examines defensive linemen.

Best pick: The Ravens selected Oregon’s Haloti Ngata with the 12th overall pick in the 2006 draft. Some teams backed away from Ngata because they said he took plays off, but Ngata became a force at defensive tackle and end for the Ravens, making five Pro Bowl appearances during his nine seasons in Baltimore. Every team needs a tough guy, and Ngata was one of them. He became one of the Ravens’ most liked players in the locker room and the community. If there was one person on the team you wanted to be in a foxhole with, it was Ngata.

Biggest mistake: Ravens general manager Ozzie Newsome always has had a soft spot for players from his alma mater, Alabama, and maybe that’s why he drafted Crimson Tide nose tackle Terrence Cody No. 57 overall in the 2010 draft. Cody tried hard to reshape his massive 345-pound body but lasted only five years in Baltimore, playing in 57 games. Newsome gave Cody every chance to play, even re-signing him in April 2014. Cody repaid Newsome by playing in one game that year, and didn’t even record a tackle. Some thought Cody might become as good and popular as Lional “Jelly” Dalton, the undrafted free agent from Eastern Michigan taken in 1998, but all they had in common were their girth and jolly personalities.