IMO, the piece Atlanta is missing is simply self-confidence.
The Falcons aren't really missing a piece, they're simply missing the self-confidence to believe they're truly an elite SB contender.
Falcons' fans and players simply can't believe they're a legit 7-0 team.
Until you believe ... you aren't who you are.
As an Eagles' fan, I don't see the Falcons as elite for the same reason. You have no history or self-confidence.
All that said, you kicked our asses in every way Sunday and I honestly can't see any weaknesses, other than Michael Turner's sudden descent into mediocrity.