With reading how all of you interpret it I still find myself a little puzzled. In the final battle Rand handled the combined powers of destruction and creation. My thoughts are that this in turn had the powers combined in him to actually become the powers of creation akin to the creator. This also goes with my thoughts on the dark one and creator. They are not two beings but fundamental forces that allow the universe to function. Destruction needs to exist because nothing can be created without it. So while each can manifest they are in essence the same being. Just an aspect of himself/herself locked away to facilitate the turning of the wheel. Also why the true source is split into three powers once the wheel turns. Fundamental forces or powers are required to keep it all going. With that power being joined it could not function. The world to work needs the dark one and his true power as it allows the pattern to function. Think of it like the fates cutting threads for death. Without that power nothing would die so the world would remain stagnant; the wheel unable to turn. The powers of creation saidar/saidin operate as one at the level of the wheel to recreate the threads or reuse ones that have been plucked or died. I think allot of it ties in with various religious ideas and with some of the ideas behind physics. Like the true source almost being the universe pre big bang, and the three powers being the fundamental forces that pin everything together. That once those forces joined in Rand he no longer could channel as the true source is not channeled but a blend of the forces making something outside the universe/wheel; one with a completely different set of rules. Sorry if I rambled a bit this has just been kicking around in my thoughts for a while without resolving.