Wait, just how much has Johann immersed himself in the local culture? Does he, like, hang out with local Elves and go to events even without Kadoh some times? Is he part of the clique on his own merits and not just as the BF?
Mathilde doesn't even bother to look for him if she wants to ask him something if he's not already working on something for her, she just leaves a note in his quarters and he comes and finds her at some point in the next few days when he gets it.