Dose anyone else think that Marde Meer could be Acnologia's human form? i have a LONG list of reasons why I think he is but ill just list a few, he is the demon king and Acnologia is the dragon king (that ones a bit dumb I know)...

I would say it is possible. But Acnologia is already a dragon so how would there be an human form of him still being around?
True that when Natsu dressed as the demon king it was very similar to what Acnologia looked in his human days but Natsu at that stage looked nothing like Marde Geer though. What is possible is Marde Geer is Acnologia's brother or relative. Mostly I think that it is this is like an Arc where siblings are shown or maybe Hiro Mashima is going to show them together (Yukino and Angel, Gray and Silver, Wally and Richard.) So the possibility is that Marde Geer is related to Acnologia but not Acnologia himself.
I mean Zeref turned Acnologia inot a dragon so couldn't he have turned Marde Geer into a demon???
There is also a chance Natsu is involved in this since Zeref was like only Natsu can defeat him. And Igneel couldn't destroy E.N.D