I don't know if there was a confirmed number by the dev team on what the minimum number was lol. We made a design decision that the two branched islands would be completable in any order as we felt that part of the joy of the game was being able to just have the freedom that came with a large stack, and we also didn't want to force linearity or 100% raccoon finding so sequence breaking is definitely allowed haha. Thanks so much for your comment!