You stated that he began doing it about 2 years ago which means that quite a few new faces who weren't very good in german joined. And if you want to instruct players with detailed tactical instruction or personal talk you better make yourself understood, like 100% understood. At least if I were a player/manager I would not really like to be in doubt when it came to this.
Anyways, Your speculations are beyond surreal tbh. Did it make sence for Evra to learn Korean when he most likely won't play in K-League? Yes, I know he was a freidn of Parks, but Maybe Klopp got a few English friends, or foreign friends outside of the club, wouldn't that make just as much sence? I'll tell you this much, that before players get the language under their skin, this goes for both sports and work in general, you stick with something that is safe and understandable. I know plenty of coaches around the world, adressing foreign players in English.
