User blog comment:Blackendedsoul/Unique Gomu Gomu/@comment-3119203-20120301133823

This is a pretty good observation, but I think that the seastone effects may have just been comic effects (I am thinking about when they were trapped in Crocodile's cage). I actually think this fruit resembles a logia in that it allows the user to turn completely into an element, but as you said, even that has to be activated.