where else is he contrasting heaven with mars?
you gave no reply here
No.
The Greek anabaino means "to ascend" or "go up"
No implication of death.
(John 3:13 [KJV]) And no man hath
ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.
son of man is not an obvious meaning it's another one of you moot points to distract what the original topic was
"son of man" refers to Jesus, you should know that.
I think the idea is clear now.
just as and even as
care to explain your interpretation of just as and even as in the context of john 17 or are you going to continually dodge the question?
So as we saw in
(John 17:16 [KJV])
They are not of the world,
even as I am not of the world.
the disciples are "not of the world" figuratively, they were born in this world, but called out of it.
While Jesus is "not of the world" since He came from heaven.
There is a comparison, but the cases are not identical.
Same here:
(John 17:21 [KJV]) 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.
"all be one" in faith, be one figuratively, and the mood used is subjunctive not indicative.
While "thou, Father, art in me, and I in thee" in nature and essence.
And note that He didn't say "they all may be one
with/in You"
nor did He say "
we all be one in
You"
This verse should make it clearer:
(John 10:16 [KJV]) And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be
one fold, and one shepherd. 
