It is my "faith" that God scheduled this experience on Easter, partly in order to affirm the living nature of the traditional narrative, whose Easter portion includes, by implication, the events of Good Friday and Holy Thursday.
Nothing about my experience contradicted any of the traditional teachings, while at the same time it informed me, in an irrevocable way, that the kingdom of heaven is within and without, one what was the high point of the entire Christian calendar, Easter. So I am of the firm opinion that the writer of ToG 1 and 3 knows something that most people don't, because this experience is significant and deserves the placement as it was granted in the text - at the front end and the back for good measure...
The notion of this experience being tied to "salvation" is not something I think is necessary (in my very limited understanding of the underlying discussion!)
It is my personal belief that Jesus recognized something, at some point, which concerned him having to offer up his life for salvation, and perhaps an generic afterlife episode that involves karma, its limiting aspects, and the overcoming of such things. This is what led to the Last Supper, his accepting of Good Friday and all of his and the apostles' emphasis on dying for one's sins.
The experience of seeing "heaven on earth" in a 'Verse 2' way is, in my opinion, a mystical experience, whereby one seemingly recognizes one's eternal aspect - at least I did - and a reality that is entirely separate from 'the world' and all that goes with it. It has nothing to do with a process that may greet us in the afterlife, whereby having another able to assume our karmic debt may be a very real consideration.