Drafting a QB is risky
The San Diego Chargers needed a new quarterback after having scored the fewest touchdowns in the league in the previous season. To obtain the second draft pick, the team traded its third overall pick, a future first round pick, a second round pick, and three-time Pro Bowler Eric Metcalf to the Arizona Cardinals, guaranteeing the Chargers the right to draft whichever of the two quarterbacks Indianapolis did not take first. Manning was drafted first by the Colts and Leaf second by the Chargers,
https://en.wikipedia.org/wiki/Ryan_Leaf
the Redskins acquired the pick by giving the Rams four high-value draft picks over three years: their first-round picks in 2012 (No.6 overall), 2013 (No.22 overall), and 2014 (No.2 overall), as well as their second-round pick (No.39 overall) in 2012.[
https://en.wikipedia.org/wiki/Robert_Griffin_III (the jury is still out)
JaMarcus Russell , 1st pick
Trading up for a QB in the 2016 draft will be very expensive with so many teams going for a good QB. That's why extra scouting is so critical this season.