Mock thoughts: Castonzo & QB trade

Nolan Nawrocki of Pro Football Weekly produces his fourth mock draft and his first-round projection focuses on offense and a trade for the Patriots.

At No. 17, the Patriots get Boston College offensive lineman Anthony Castonzo.

"The Patriots have done a very good job scheming protection on the offensive line to conceal the shortcomings of their left tackle," Nawrocki writes. "However, with Matt Light unsigned and Nick Kaczur proving unreliable, the Patriots would benefit heavily from a very smart, versatile and dependable left tackle such as Castonzo."

At No. 28, the Patriots trade out to a quarterback-needy team looking to get back into the first round.

"With value being greatly diminished at this point on the board, expect the Patriots to convert this year's 28th pick into a much higher selection next year," Nawrocki writes.

ANALYSIS: Patriots offensive line coach Dante Scarnecchia led Castonzo through drills at BC's Pro Day, getting an up-close look at a prospect some view as the best tackle in the draft. Similar to J.J. Watt, one factor to consider is that the Patriots haven't negotiated with Castonzo's agent, Tom Condon, since 2004 (Benjamin Watson holdout). However, a rookie salary cap/wage scale might change the team's outlook on "signability" -- which is a factor that is weighed each year. Trading 28 for a 2012 first-round pick (and another asset) seems like good business, assuming the Patriots can find some quality defensive front-7 help in the ensuing rounds with their multiple picks.