I know Brad said there were short tees at Trophy Club but only the longs had poured concrete. I didn't know there were a third set of short/middle tees. The square tiles with the 'X's on them are the drop zones for the mandos. That could make it a little confusing. That and some of the old tee boxes are still there (the gravel filled boxes).
I'm pretty sure every hole had a set of X tees. Not all the holes had mandos, so I really didn't think they were drop zones. I guess it could be, but it really looked like another set of tees.