Good point. If I were to make such a character, I can assure that his Fort would be through the roof, and I'm not sure at all about the other two saves, but as it's gestalt, I'd say they would at least be decent (as in good saves from classes, but I'm not sure how much of a boost they'd be getting from ability scores or items).
Of course, actually making such a character would likely be boring. It would be able to dish out fairly decent damage and tank like a champ, but probably do little else.