After several recalls on Ford Escape and Fusion models, Ford in an unprecedented step was shipping MKZs built at Hermosillo to Flat Rock, Michigan, for quality validation.
From a TTAC article about MKZ QC issues:
More:
Pictures of the roof issue TTAC is referring to:


World class facilities shouldn't be falling on their face like this, these QC issues really impacted the launch, shoppers were showing up to dealers to check out the car they had seen plastered everywhere during the superbowl only to find there were none to be found.
Its not like Ford didn't have a strong interest in the successful launch of the MKZ, Lincolns future essentially hangs with the MKZs success as a mid level lux sedan.
Same goes for Mercedes, if the GLA suffers from fit and finish issues shoppers wont hessitate for a second to jump ship to Audi Q3s, BMW X1s or Porsche Macans. Not to mention if they run into a delay like Ford.