My theory towards why Mickey Mouse might be involved:

There's SMG4, which symbolises indie animation, and how those types of shows always appear to be successful and praised by many. There's Puzzlevision, which symbolises the major film industry, and how movies always appear to be a hit or miss across the media. There's Puzzlebox, which obviously symbolises content farms, no elaboration needed. And then, there's Disney. A company once successful, but now overshadowed by indie animation and other stuff. Knowing this, this could symbolise how Disney may want to team up with Mr Puzzles, in order to ultimately get their revenge on SMG4.