I need to clear something up?

Okay so I Watched Supernatural From the very Start and have just finished season 5 ( Btw if you havent watched it dont read on cause it will spoil it !!!!) I just finished the episode where Lucifer ( Adam) And Michael ( Sam) Have fallen in The hole to the cage thing ! At The Very End the prophet chuck is narrating , Then he just vanishes! Does the mean he was secretly an angel ?? Please no hatter comments. Thank You :) xx