They are. They're good friends. I'm not sure if they're here or not, though, that I've seen. But ah, well, the eidelons are kind of unique to the Summoner tribe from Madain Sari. Usually. There's....um. Shiva, Ifrit, Ramuh, Atomos, Odin, Leviathan, Bahamut, and Ark that Dagger can summon. Eiko can summon Fenrir, Phoenix, Carbuncle, and Madeen.

[Some of which would definitely sound familiar to Dion. Not that Vivi would know that, as he lists them and counts them off on his fingers with his gloved hands as he follows the other from the fighting arena.]