I have seldom seen a man so blatantly add to scripture to get to a point. Nothing is "OBVIOUS" except what the Lord SAID. You have not only set yourself among those who must add to scripture, but patently have shown that WITHOUT your additions, my argument stands. Added to this you have ASSUMED an arrival at the Father's House when Jesus ALREADY WAS the Father's House (John Chapter 2)
You have set yourself a problem with this verse already. First, the Son of GOD is not "limited by the bounds of space and time", but the Son of MAN is. "This DAY I have begotten you"!!! (Ps.2:7, Act.13:33, Heb.1:5). Secondly, in this verse 13, according to the grammar, the Son of MAN FIRST ASCENDED and THEN DESCENDED. John 3:13 says; "And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven." That is, the One who IS (present tense) in heaven, FIRST ascended (past tense) that He SECOND, might come down (past tense). When this explained, then only can we deal with Him being, at that same time, in heaven (present tense). No doubt verse 11 will help with this because our Lord was testifying of what He had seen in heaven, but that it was OUR witness. Where was the second or more persons to make it OUR?
Explain all this, without adding to, or subtracting from, scripture, and then we can address the mystery of verse 13 - and then maybe why Ephesians 1:3 and 2:6 says that you are IN heaven but you are not.