Must great teams build through the draft?

One of football's widely accepted maxims is that good teams are built through the draft.

But are they?

Pro-Football-Reference.com blogger Chase Stuart was skeptical. Stuart, acknowledging that the Super Bowl champions featured several key players they didn't draft, created a system to determine what percentage of a team's approximate value came through the draft as opposed to players acquired through trades, free agents and undrafted rookies.

He posted his findings on The Fifth Down blog at NYTimes.com.

The AFC East didn't fare so well.

Here are Stuart's rankings:

15. New England Patriots, 60.2 percent

21. Buffalo Bills, 56.7 percent

22. New York Jets, 56.0 percent

27. Miami Dolphins, 50.0 percent