I think Potter will be disappointed, as I have a feeling he missed out on accepting several PL jobs for this one. I don't think being Bavarian makes him less German, even if they have their own regional traditions. There's no separatist movement like in Catalonia or Scotland.
I think Tuchell is a good coach, and anyone who has won the Champions League must have something. The only thing is, he's not a Yes man, so that can end in conflicts. Therefore, I think a 18 month contract is wise, as if there is a conflict, and with our tabloid press you can bet they would amplify that for 100%, the FA wouldn't want a hefty compensation bill to pay.