I would just add that although the TE is the BJ's key most of the time, his primary key can be the outside reciever on a formation with two recievers outside the tackle and also in a 'trips' formation. The wing would have the initial action on the inside reciever.
For area of coverage, I envision a triangle whose top point is the ball and extends to each corner of the end zone. Shade that in and that's the BJ's responsibility.
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