Hmm. If the SI had a weaker self-image as a definite human, I wonder how long it would take to transition into the cave, filament-grab and subspace all the rings and transition back out - and then when he next gets a few free minutes, "Ring, make me into a Martian and upload Mr J'aarkn's knowledge base into my brain," followed by tentacles, tentacles everywhere... and then tentacles neatly tucked away inside a Paul-shaped human-looking body with built-in flight, intangibility, shapeshifting, super-strength... and equipped with 500 power rings.