two things I learned from this year's SB (both on O):

1. delays over the middle are the toughest to cover. receiver throws a quick block, then releases and looks for/crosses to open area.

2. the scramble game/sandlot has cemented itself as the new thing. The qb standing in the pocket, waiting for wr's to complete their routes/looking for secondary targets to complete their routes is over. Maybe that's the initial first seconds, but from there, wr's are looking for openings and qb's throwing to openings on the roll out/scramble is tough to defend.

Agility, coordination and quick wits are more important than ever.