It looks legit, I wouldn't be surprised if there was no way to debunk it.
Is there any way you could send the pic to another third party paranormal team to see if they can work out what it could be.
I've tried that with several groups and also tried some professional bodies including universities, but not had any further luck in getting it looked
at as completely as I would like. I'm not an expert on photo examination so there may be some methods I am not aware of .. which is why i was hoping
to get it checked properly.