I have a fuzzy memory about a strange detail. Kaiji learns in the dark room that repeaters need 4 stars to "survive". However, he trapped before Funai and forced him to trade with him since there was nobody left.
What happened then, shouldn't Kaiji have asked for all of his stuff beyond three stars? He didn't know yet Funai needs 4 of them. Did he leave him an extra star for no reason?