I'm also leaning towards option 2. Davesprite and Xion are both generally fairly cautious kids and would know to ask for help. They may only be able to contact a couple people on their own on account of fighting for their lives. If Waver's the one that ends up contacting, say, Saber et al, that might work out better: Sephiroth gets to trounce both Team Sabersprite and Team Princess Hair and Eyebrows before Team WOW YOU LADIES ARE TERRIFYING shows up.