You are correct.  Random noobs on this forum INCORRECTLY stated that the only valid game theory path was to dump BCH (think it was derived from some nonsense Szabo fabricated).  He made the error of assuming you're required to keep one token at all.  The real optimal path is to dump both of them in event of rough consensus attack.  If you refuse to dump both for whatever reason, then the optimal path to try and minimize loss would just be to hold all of them.