It is simple, the older version was retconned, and the GBA one is the canon version now... POTFS is in the GBA version, thus is canon. Simple and easy, unless you are too stubborn to admit it
What kind of non sense is this...
ALttP fits well after FSA... Well... FSA looks like it was made to be the prequel to ALttP.
And what Zemen said about the Four Swords Palace: he is totally right. You don't need to promote something if you already bought it. It was a way to encourage people...