Plot hole?
Wouldn't the pilot have also received the stone when he first joined the game? If not, there was no way he would get out. Of so, did his disappear when the new characters came in?
shareThe game seem to conform to whoever is playing it and it seem to dig into deep rooted personal issues these gamers have at home.
The first Jumanji (1995) was about Alan and his estranged relation to his dad (why the same actor played both the hunter and his dad). The second (Zathura: A Space Adventure (2005)) was about dumb rivalry among brothers and this third one seem to be about mutual respect among your peers and to believe in your true-self - something all of them had problems with.... so the question is, why did it englove the Pilot player then?
Perhaps the same reason it took the others and so it stands to reason that it had him in an impossible situation until other players would join because it needed multiple players for this particular lesson... the Pilot had been caught a month time - he believed. But he was likely right in Jumanji time, that is. The game was holding him until it would get other players to play ITS game, ITS agenda... see what I mean?
If so, he was not handed any stone and it is no plot hole. He was more likely instructed to steal a transportation vehicle and leave the valley this way - which the game made sure was impossible until the rest of its pupils would join-in... the game made it clear somehow that he had to wait for others to join, to help. Which is what he eventually did.
In truth, the game is playing them. Not the other way around. And to understand it... to really understand it; we have to realize that it focuses on deep rooted personal issues and aim to resolve these through its trial outs.
Brilliant.