Lord Dante, seeing that Grey was truly challenging for the top spot, couldn't help but have a bad feeling about offering to take Grey personally into his treasury to pick up whichever darkness elemental treasure he wanted. The fact that Grey moved after hearing this meant that he was confident, but which genius isn't confident in their abilities?
He believed Grey only believed he could achieve it, but he didn't think could really achieve it. Naturally the Elders, and someone like him has heard of Grey Dawson, the person the Gnomes want dead. This fact alone is enough to show that he wasn't ordinary, but getting into the top ten in a competition that has multiple Seventh and Eighth stage Sovereign is nigh impossible.