GZ at op-sealion? It wouldn´t have been ready in time. Production was delayed with the loss of the Bismarck and later postponed (with a short exception in 1943). My point is that GZ ,under normal circumstances, wouldn´t have seen much use. It would have been putted into a "safe" norwegian Fjord and therefore it could last. It would have been very risky to attack her. (...but I don´t doubt that the Brits would try...) But I don´t see why it should have been sunken soon, lets say, in late 42? Why? Imagine a reliable scenario, I´m open to change my mind...