I'm loving all the discussion of this 3-4-2-1.
A few points made that I wanna respond on, but don't have the time to quote directly:
* How do we fit Pirlo and Lampard into this shape?
Lampard for Mendoza? Or Harrison?
* We gave up the middle.
I'm gonna put this down to 2 things: 1) Bravo's lack of possession ability and 2) perhaps a lack of familiarity. It takes a while to figure out both where to run and when to make that run. These things take time.
Numerically, this formation doesn't really put us at a fundamental disadvantage in the center. Specifically against Columbus's 4-2-3-1, we should have a 4 v 3 overload in the center. If anything I would have expected to get destroyed on the wings (Columbus theoretically had 2 v 1 in wide areas), rather than through the middle. I'd have to watch it play-by-play, but maybe Mendoza and Harrison both went wide in D, leaving us 2 v 3 in the center. That's easily amended though - have one of the two tucked-in forwards go wide if play goes down the side, have the other one drift into the center to give us a 3 v 3 in the center.
I'm not arguing that we didn't give up the middle, just that I can't think of a fundamental problem with the formation that would explain it. Lacking that, I'm more prone to thinking of other factors, like personnel, familiarity, run-of-play (i.e. who wanted it more based on the score), whatever.