Given that Germany is the dominant power in the EU, it makes some sense to have a single ambassadorship to both, though all that commuting will cut further into "face time" to lobby politicians in both Brussels and Berlin (ah, for the old days when the German capital was in nearby Bonn). He will need a private jet to bounce between B&B efficiently.

Still, Dion is the wrong man, primarily because he does not speak German. He should have been given only the EU posting.