From my understanding, X can't pick S2. They're auto slotted into S1 if they are in fact elected as the #1 seed.South seeding and bracket selections will be very interesting.
X and Moeller pick opposite brackets and Elder goes after X.
Moeller would get N1, but St. Ignatius isn't stellar this year. Then they would also avoid Darby in the semis.
X may pick the South 2 bracket though if they plan ahead.