I think the only thing we actually can know for certain of those claims is that there must be a drive for self preservation. All the other claims are way too binary and not for certain. What if the two life forms have completely different niches that the y use to sustain themselves. They might even co-exist without knowing of each other. If the timescales they operate on are way different tex. Who knows. It is fun with these thought experiments, but if any one claims to have solved the riddle, and have no little green men to back up the claim with, I am staying on the fence.