I guess that for the menus, only Steve Whitmire and Eric Jacobson (and another performer for Fozzie's right hand) were hired, and only their characters were there. But maybe one of the disc menus could have had Link Hogthrob and Miss Piggy, since Link has been performed by Steve Whitmire on a few occassions. Or maybe Animal could have been paired with one of the many monsters who doesn't have a consistent performer. It could have been the return of Boppity (or the return of Gloat, or the return of Doglion). Or maybe Miss Piggy and Foo-Foo could have hosted a menu.
I would have preferred Animal to have been teamed up with Lips, but then again, having Lips on a second season set would be just as out of place as having Rizzo there.