Hell will freeze over before the German government lets Deutsche Bank go bust.
They let Greece go bust rather than the Landesbank.
They let Greece go bust rather than the Landesbank.
However Deutsche Bank is a private company. It's still likely to be kept alive, but it's not as certain.
It more a case they may have to bail out Greece rather than letting it default and take out the Landesbank.
A lot of the problems could be prevented by the German controlled ECB easing monetary policy and aiming for say 2% inflation rather than the present 0%.
European institutions are largely determined by "every member gets something", not economic size.
In this example, the Governing Council of the ECB has 25 members, two of which are German.
It is "first among equals" in the sense that no country has more members and few have as many, but what you're insinuating is factually wrong.
When it comes to any European organization, just assume that each member country has one vote and you'll always be very close to reality.