The 6/15 post called Difference Between Fallen Angels & Demons at http://www.fivedoves.com/letters/june2011/carolg615.htm states "fallen angels cannot possess or enter into an object, person or animal as demons do."  However, there is one example in the Bible where a fallen angel entered into a man because Luke 22:3 states, "Then entered Satan into Judas surnamed Iscariot, being of the number of the twelve. " So a fallen angel must have the same ability as a demon to enter into a person. 

 

Based on that, isn't it possible that Satan will enter into the beast in Rev. 13 because Rev. 13:5 says, "And they worshipped the dragon which gave power unto the beast: and they worshipped the beast, saying, Who is like unto the beast: who is able to make war with him?"?