In my view (see this article) no relevant teaching of Jesus Christ and no dogmatic declaration of the Catholic Church are impaired if one removes the condition of genealogical descent from a single couple.
The crucial descent is that from a population sharing the kind of body God chooses for His Son. By this choice God defines the humankind as well.
So I would be thankful to know the motivation for endorsing common genealogical descent from a single individual Adam.