Coach Eric Mangini has made big strides this offseason overhauling his defense, as he continues to find the pieces to properly execute his preferred 3-4 scheme. After bringing aboard veterans Kris Jenkins to play nose tackle and Calvin Pace to play outside linebacker, the Jets’ selection of OLB Vernon Gholston is the third major front-seven fortification since the season ended. Gholston could be a terror off the edge, but he must learn to play hard every down. A rare physical specimen, he’ll team with Pace and ’07 rookie sensation ILB David Harris to give the Jets a trio of formidable, young linebackers. TE Chris Baker’s ordinary speed and playmaking ability convinced the Jets to trade back into Round One to nab Purdue’s ultra-athletic Dustin Keller. A scrappy yet underwhelming blocker, his receiving value will open things up for the wideouts, including fellow draftee Marcus Henry. A lanky possession receiver, Henry will compete for playing time at a position many believed the Jets would address earlier in the draft. With the uncertainty at quarterback, Tennessee’s Erik Ainge was added to the mix in Round Five. Although a late-round draftee, Ainge’s polish and experience playing top-flight collegiate competition make him a possibility to see rookie minutes if Chad Pennington and Kellen Clemens struggle. CB Dwight Lowery’s gaudy interception numbers — 13 over his last two seasons — don’t account for his coverage vulnerability. Massive OT Nate Garner is strictly a developmental prospect.