I think it is also important to remember that Jesus (in John ch. 17:21-22) - in praying to His Father (Heavenly Father) - said, 
21 That they all may be one; as thou, Father, [art] in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me. 
 
22 And the glory which thou gavest me I have given them; that they may be one, even as we are one:  
 
To me, I believe that Jesus is showing us what is meant by being one; or should we really think that this means that we will all be just one person?