Some thoughts:
1. Practically no one will be returned
2. Once they are in Europe, even in these “centers”, they will stay in Europe
3. People will disappear from these centers in droves
4. This basically is the status quo: lipstick on the pig
Basically, you are correct.
The guy has to be picked up (for each episode, you can anticipate a minimum of twenty cops required).
You will have to have some kind of court activity, to make it ‘legal’.
Then you process the guy, and probably fly him to the original country where he signed paperwork.
Within twenty-four hours of arrival, he’ll disappear, and show back up in Germany within a week. Then you will repeat the whole process, over, and over, and over, and over.