We're actually spoiler tagging Jumanji ...
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In the original movie at the end Robin Williams returned back to a kid and erased the 20 years he had spent in Jumanji as if he had never played the game. He retained his memories from when he had played the game, but the kids memories of it were erased as was their whole timeline of having played Jumanji. The ending was vague and it sort of implied that it was possible that after 20 years had passed they would again have to play Jumanji, as they originally had. The film ended there and so we don't know if that was the case.
One year later the events of Jumanji: Welcome to the Jungle begins. We learn this is indeed Jumanji 2, and the events of the first Jumanji had occurred in this timeline.
Th impression that I got was that the kid was returned to 2017 as an adult. It didn't occur to me that it might be the same as the first movie and he was sent back those 20 years again. The reason for this was that he retained his memories of the last 20 years and having played Jumanji, like in the first movie, but UNLIKE the first movie the kids also retained their memories of the original timeline, which was now changed, and their own memories of having played Jumanji.
The first movie followed the logic that since the start of the game was overturned, the continuation of it 20 years later would not happen. In this movie both events happen, but also don't happen. That was what had me confused.
Also the budding romance that had been forming between the teens either "just happened" or happened in their memories, but one is now a 40 year old man and the other is still a 16 year old girl. That's really creepy. For that reason alone he should have just came back as a teen, and besides we never really knew or cared about his original person/ non avatar anyway.
And making him a well known actor in essentially a cameo was immersion breaking for me. I could suspend disbelief about the other big actors because they were supposed to be simulations and they also had developed characters, not just a couple minutes of screen time.
Spread out all around us is a petrified world, a world of Things, where we ourselves, our gestures, and even our feelings figure in as Things. Nothing can belong to us as truly our own in such a landscape of death. Under commodity occupation the most concrete truth about everything is the truth of it's infinite replaceablity.