This idea of paralogy's definition is relating to genes that are descended from the same ancestral gene by gene duplication in the course of evolution, especially when present in different species that have diverged after the duplication.. But lyotard is saying a similar thing which is to go beyond or against reason. "reason" is human made and human developed rather that or in lack of. It can be changed to fit each different person as means necessary. The language game is universal but rules are different. I think that the idea of paralogy is legitimately possible once we become aware of all and at ease with the unknowable.