And the dealer said that the Hybrids didn't qualify for the xplan (or any plan as far as he could tell). I got this same story from all three dealers that I called.

Apparently Ford re-imburses the dealer for the discount, so that they still make their money, and if there is no qualifying plan, then Ford won't pay.
Sounds like your dealer may have screwed him/herself, but it worked out for you!