True, however its going to take a LOT of work for them to be built in Mexico with an assembly line that has clearances for the Fiesta. I've never been there (obviously) but one would think that it's not as simple as running an Escape body down that line. I'm sure they would have to redesign some parts of it to have enough clearances for it.
Again, it's definitely capably of building the Escape and MKC, but like I've said time and time again, there's not enough room there on the line for the extra parts. I would know, I work there (for now)
Which is why it took so long to move production from Turkey to Spain. And why it's not likely going to ever be built in Mexico. If anything Kansas City alongside the full size Transit is the most likely candidate if extra production is needed. Less work, downtime and $$ invested in redesigning a whole plant.