You're right, it doesn't HAVE to be, but it's obviously what he's going for. He got it with the Tigger shot but who'd want that creased material showing up in the lens shot?
I know what he's going for, but I also know the preponderance of people who believe that "low Key" just means a poorly lit subject on black, which is why I made the distinction.
Read this line again:
It's that statement that I was responding too.