Board Thread:Theories/@comment-217.99.170.105-20151212222428/@comment-26998423-20160102185707

Indeed

They don't point to Marco being alive...

And on top of that, they are not relevant to the story plot... especially after such a long time.

So, in my opinion, it's just a fan being hypnotized by a loophole/silence/ellipse from the storyteller.