7 And there was a great battle in heaven: Michael and his angels fought with the dragon, and the dragon fought, and his angels.
8 And they prevailed not: neither was their place found any more in heaven.
9 And that great dragon was cast out, that old serpent, who is called the devil and Satan, who seduceth the whole world. And he was cast unto the earth: and his angels were thrown down with him.
Do you think JPII was unaware of the "mythical" vision of Leo?
Why didn't he take the time to clarify it when he was clearly making a statement that could be confused with the world famous "myth"?