Again, why do you keep changing an undefended transport to a defending combat ship, I mean why stop there, why not change it into a tank or a conversation about strategic bombing….
OK, let me make it a bit more absurd.
Case #1 A fleet moves from SZ 10 to 11 finds an enemy transport (no friggin DD OK), one sub stays in SZ 11 to dispatch it, the rest of the fleet moves to SZ 12 and performs an amphibious assault and the battleships can bombard as they didn’t have to fight the transport in SZ 11
Case #2 The same fleet starts out in SZ 12 fully loaded with an enemy transport present. Now to dispatch this same undefended transport it requires all the capital ships?
Again, the only difference is, case #1 the fleet was moving through then doing an amphibious assault . Case #2 the fleet doesn’t even have to move. Even if you forget the movement issue, which in theory should favour the stationary fleet (more time to perform search and destroy if you don’t have to move into the territory to do it…just saying…). Why in case #1 can a single ship accomplish the task and in case #2 it cannot. Just keep it simple and don’t add in enemy combat ships…