It is very much a grey area, but it's the closest WDW has to even a M&G in the park. Which, i'll agree, it must be a super grey are at the moment as they have shown the preview and done M&G's on exactly 2 dates - both private events.
They obviously don't feel they have the ability to use them on a daily basis yet (if ever). They could still be trying to find a loophole or whatever, but I can guarantee if they had found one, Star Lord and Gamora would be out regularly in DHS, especially with how much they've been closing lately.
Just saying it's not an open and shut case.