Perhaps there could be a common meeting ground on some other part of the island, not necessarily through a cave, where the two tribes could meet and learn from eachother. The tribe in VV I has berries, fish, crabs, and magic fruit. They also have a "magic" lagoon. The VV II people lack crabs, berries (fruit), and any truly medicinal plants like the cactus. It's much harder to train a doctor when there is no true focus for training. However, it does result in interesting stews!

These are both excellent games, and I do look forward to VV III very much!