After last night's performance, I am now firmly in the "Seal is the Leopard" camp. Seal's (real) signing voice is pretty distinct, and he wasn't trying to hide it.
The Leopard alluded to that in this clue package though ("I don't care what they say about what I'm wearing-or even my relationships"). By the way, back while Seal was still married to Heidi Klum, they were known for dressing in elaborate costumes for Halloween.
I just caught another clue in the first package that was hiding in plain sight. One of the newspaper headlines was "The Runway". Of course, Heidi was known for