Yea, it's pretty much stated it's not related to the Triforce directly. It says it was a gift from the Picori,
Yeah, where the heck
did they get it from, anyway?? And where did the minish
go after MC? They're never mentioned again! I do find it interesting that the "fourth piece" is upside-down, and moved away from the rest of the triforce. I don't believe in the tetraforce, not yet, but I'll admit that it is a really interesting theory, and there was some cool evidence discussed on the second page of this thread. But, it almost looks as though the triforce was previously one triangle, (probably looked like the light force in MC) and the person representing the center was banished. It looks as though the fourth piece was
pushed away, as it is in reverse, and far away from the rest.
On that note, if you recall back in MM, the Ikana Drawings depict the triforce upside-down, and seem to dislike it, as though it is a symbol they hated. If there was a tetraforce, it may be that the center person was once good, and then for some reason turned evil, and was banished by Nayru, Din, and Faore. Eventually, this piece was even removed from the shields that were made, and everyone forgot about it...
You could possibly even think that (if you want to really let your thoughts wander), what the fourth person did was so evil, they were banished to Tremina, and represent the Ikana Valley Inhabitants. Perhaps Link was also sent over there to discipline them a little more... This would imply that the two worlds are more closely connected than we previously thought. After all, the Happy Mask Salesman was able to go to Termina of his free will.
As I stated before, I don't believe in the Tetraforce, this is just what I think they'd do if there
was a fourth... If there was a game where they added the concept of the tetraforce, I think it would be in-between MC and OoT. I dunno, is there anyone else who found this interesting?