Talk:Great Demon Lord/@comment-36209226-20190214203126/@comment-10330822-20190220012354

Remember, Rimuru is unrankable, that is the "class" above Great Demon Lord and Demi-God.

Unlike Yuuki, who had a physical limit, Rimuru is a being with infinite consumption ability and he was trapped in the null space. He consumed so much nihility energy, which the ultimate counter to stardust energy, and can create imaginary rooms to counter skills.

So, it has less to do with raw power, and more to do with OP skills. Nothing Yuuki had actually made him stronger than Rimuru, even the Reactor operating at 100% efficiency is irrelevant because the reactor only gives you maximum mana regen, it doesn't increase the amount you use. Rimuru on the other hand can continue absorbing energy indefinitely.