Kelvin hid in the core of the world like a turtle. He had been conned, but that didn't mean that he had given up.
He had learned that the Justice League was looking for certain people. The offense of these people was unknown, but the features that were used to identify them were consistent with what he knew of what the ringer bearers should have.
For example, the bearer of the ring of paragon should have an omega ability, and parts of their bodies should be golden. For example, these golden parts could be their hair or their nails or a tattoo or eyes.
The bearer of the ring of the mind should have infinite focus and perfect memory. They should be someone who doesn't sleep and should be highly intelligent. Last but not least, a part of their bodies should be golden too.