The rational to have only the DC Federal Court for only DC official critters is out of date... as you can see by the old dates.
If it was for technical, logistical, or localized reasons, that would not hold true today when the reasoning was made for DC only.
Because with modern telecommunication, the Internet, and fast contemporary travel makes the DC court quo warranto thinking obsolete.
Not only that, but his ACTUAL address, his HOME address is still in Chicago, Illinois. He is only temporarily, (I hope,) SERVING in DC.