maybe there would also be a leg gene unlocked by getting a nichling with both the mandibles and the abdomen + 10 island moves?
this gene would add another set of legs under the ' arms ' they would act like the nimble fingers and runners leg. possibly giving you 2 speed 1 stealth and 1 collecting. ? this would disable is the other leg gene is different, it would remove the 2 speed , 1 stealth and 1 collecting, replacing it with 1 speed and 1 stealth then have whatever abilities the other leg gene has +1 to each ability.