User blog comment:Pualover/Overlord Power Level/@comment-80.213.121.95-20150911164756/@comment-26930675-20150911171358

Stronger than Solution just means that he is around lvl 58-60. Shalltear would have said that he is stronger than Narberal if he was more powerful than lvl 63 for example.

Moreover, his judgment over Shalltear's power compared to Zesshi's is just his assumption and is probably completely inaccurate. But he is also shown to be doubtful of his own assumption.

Finally, her lack of interest was not because she believed Shalltear to be a Dragon Lord but because the Captain of the Black Scripture told her that she was stronger than the "mysterious undead that they fought".