Questions about Season 2

So as I was rewatching season two i had some questions about certain things-

heiya said she was the only survivor of her first game (where the arena blew up). i was wondering: as the beach had all cards, how did the Beach get the card of her game? was she there? or was the game played and won before?

second question: in kyumas game, shitaru died. What if Arisus Team hadn't won the game? Then shitaru would still be dead and kyumas team would only have 4 players left. Would the card be gone or could another team just try again? And would it be a 4 vs 4 then?