Absolutely ridiculous. It is a league rule that if you have 3 or more players called up you can postpone a game. Saints would have no option to object, it is a rule.
As for Plymouth's responsibility to sign players available during the season - so if Guly, Fonte and Lallana for instance are called up you wouldnt want our game called off then ?
Plymouth have no money, are in administration. I would think getting any player from anywhere is difficult enough.
There are other teams and circumstances apart from Southampton you know.