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I speculate about his new codename.

I thought that his new codename might be Ghost Leopard, or Ghost Cat, or Grey Ghost, or Snow Leopard (because of his "Kasper" nickname).
http://www.telegraph.co.uk/news/earth/wildlife/8207266/The-snow-leopard-ghost-of-the-mountains.html
http://news.nationalgeographic.com/news/2014/01/140125-snow-leopard-pakistan-animals-science-world-endangered-species/
http://www.bbc.com/earth/bespoke/story/hunt-for-the-grey-ghost/
https://www.virgin.com/travel/the-hunt-for-the-snow-leopard-the-grey-ghost-of-the-himalayas

Then, I suddenly realized that his new codename might be Coal Tiger.

He impersonated Black Panther. Then, he had the codename White Tiger, which is a rank in the Panther Cult.

The name Coal Tiger has often been associated with the Black Panther.
https://en.wikipedia.org/wiki/Coal_Tiger

Last but not least, Cole & Coal sound the same.