If you want to continue after this, to make NCSCSwitch happy, I recommend opening a new thread.
A Destroyer in SZ 7 does not make your defense better. Now you are short a destroyer in SZ 8 and a Transport in SZ 12. Both of which can be readily cleared allowing Germany Fleet Unification if that was the attempt, but both being destroyed with barely a 50% shot of taking out a German submarine. That’s 8 IPC to sink 20 IPC worth of allied material. That’s in Germany’s favor.
Given that situation, why should I not take out the destroyer, transport on Germany 2 and put 2 Carriers and a Transport in SZ 14 with the Battleship, Transport, Submarine from SZ 13? (Allowing a large invasion of Africa to be a threat, but even better, facilitating the invasion of Russia faster.)
Sure, you could muster a large fleet to sink it eventually, but the idea here is to negate America and England as a threat through the conservation of German equipment, effectively leaving Russia standing alone against Japan and Germany. If you are busy attempting to nullify Germany from getting a huge win navally for the first two or three rounds, I think that is a success. That’s 3 rounds with no help for Russia.
China J1, Sinkiang J2, Novosibirsk J3. You are now, maybe, in a position to help Russia just as Japan reaches Russia’s door (and don’t forget Germany doing the same thing.)