So, let me get this right. Assuming the kid has football talent to be high on a draft board, you think one DUI is reason enough to completely take him off the board. You believe in a one-strike law. Wow! Look college football players are young kids. Some drink. We all know the temptations kids have. You have to assess the total circumstances. Did the kid learn? was he remorseful?
If you believed in your standard, you would not have taken Hernandez in 2010 or Mallett in 2011. And don't tell me that is OK because they fell to the fourth and third round respectively. Those picks are as nearly as precious as a second round pick.
More important, the Pats have a strong locker room. Draft the best talent. Then have confidence first in the coaching staff, and second, in the veterans like Wilfork, Mayo, Light, Brady to initiate and help the rookies. Other teams do it. The Ravens. The Steelers. The Cowboys.
When you talk of schemes, you are still talking of projection. BB relies on for the physical measurables of a player and his projections, which we know are fallible. Both Shawn Crable and Cunningham had the measurables -- yet one did not play and the other is an admitted disappointment. You don't allow that you could be wrong in your assumption that Dunlap could not play in the Pats scheme. Many experts felt otherwise deeming him to be a better "fit". Dunlap was the higher rated talent -- with Cunningham expected to fall to the 4th or 5th rounds.
Finally, ask yourself this question: Knowing what you know now, would BB have passed over Dunlap?
Bottomline, if you can get a top talent who is also a high character guy (like Andrew Luck) don't hesitate. But that may not always be possible. You may often have to take someone talented but flawed, with the confidence that you can coach them and your locker room can help to maintain a team-first attitude.