I'll pass that on since my Instinct Hydro was deleted, but what?! Zone 7, so many people are talking about it, mind telling us what Zone 7 is, it's after Z5 Heroic and Z6 isn't it?
Pseudo-EDIT: I think I misunderstood the question. You can have only 5 others in the party at any given time, but you have a total of 7 different team members over the two games, unless you count the Paladin, who is technically on your team for one battle near the end of Z3.