Well,I think it is like this. He had 100 power points, and put in 50 and still had "physically" 50. It had to have taken a lot of power to make a ring that could control all others. And in doing so, he gave power to the ring, thus losing his original power maybe 50%. So with the ring he was still full 100% but without he was 50%. Thus the reason he could be cast down but then drag himself back into being. And he used so much power trying to defeat the world and gain back his ring in the process in the end, and when the ring was destroyed he was utterly cast down into nothingness, just a whisper of what had once been.
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