Kain was perhaps half-right. Rydia didn't consider her idea to be especially sneaky and it wasn't even designed with the (sole) intention of keeping him from being a total hermit. Still, she wasn't blind to the possible result.

Rydia's brow furrowed as she mulled over the possibilities. "I thought being at the Tree would have revealed something, but I didn't notice anything strange about it. That might not be our only source, though. There was a moogle who mentioned the Shimmering Island as being active again, and it dovetails with Eiko's story about Gaia's elemental shrines. Unlocked, they opened the gateway to another world...the one from which the trouble first originated. It was inert for a long time, but like the mist, it returned...."