Obviously the devil is in the details, but I can well believe that there are places in the Ruhr which relatively need help more than Leipzig does, esp. in terms of local government finances.

Of course, the problem remains that (as happened to certain areas in the UK) if the subsidies to areas of the East are not maintained you will see ongoing migration of the young and economically active out of those areas, which rather creates a self-fulfilling prophecy of decay.