What happened: Buffalo enters the preseason without a clear No. 1 receiver, while Dallas faces questions about its pass rush. New England's edge group lacks a dominant defender.

Why it matters: Buffalo's uncertainty at receiver puts more pressure on its passing game to produce by committee. New England's edge issue could force its coverage to hold up longer without quick pressure.

What to watch: Final cuts and late preseason moves will show whether the three clubs seek outside help before Week 1.