Just a further thought:
I disagree that "even the Son of man which is in heaven" is a future statement because "which is in" is present tense, not future tense.
I think it probably suggests that Jesus' divine nature is in the higher heavenly dimensions (Son of God) simultaneously with his human nature (Son of Man) being in our 4 dimensions of spacetime, because I see Jesus as a god-human hybrid entity.
Do you remember the seven levels of heaven and the idiom, "be in seventh heaven"?
I imagine the editors of some of the versions might not have been aware of String Theory and its 11 spacetime dimensions.
