Why is that a different debate?
Do you not know the difference?
Evo's routinely offer examples of speciation as proof of Genus creation. To wit, for all of the discussion of the mutation/natural selection/evolution of bacteria, E.coli is still E.coli after all of the experiments.
The evidence for common descent is vast and involves dozens of lines of evidence. Even young earth creationists admit that variation can produce change up to the Family level. Check out baraminology.
But I am still asking how the concept of species applies to bacteria. Such organisms routinely exchange DNA in processes that resemble sex. These exchanges are not bound by any easy rules of type or kind.