My reasoning behind keeping Swabia as the castle and turning Metz into the city is simple. Current infrastructure and cost effectiveness, as well as proximity to our core.
Staufen is already significantly more developed as a military structure than Metz, and still close enough to the river crossing I'm talking about that changing it to a city and spending the money to rebuild everything that is in Staufen, later in Metz simply isn't worth the time or the money. Having a castle on your direct border isn't always cost effective when a simple fort could do the same defensive job and the castle is a short enough distance away to receive reinforcements with little difficulty. Moving the castle to Metz would also place any potential help that could need to go east or north even further away than it already is. That's not really an appealling prospect.
Just my two cents.
By the way, short little epilogue of the Hamburg battle now up for reading in the Short Stories thread.
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