What is the answer to this colin leslie dean species paradox?

That paradox is nothing but Bull Sheep! Evolution is an OG process.. meaning it changes smoothly due time. Also take note that species has some degree of tolerance on which specie or individual it can procreate with. So Species A when mated with another Species A wont result in Species B right away but will result in something like Species A.1 . so overtime this Species A.1 will be prevalent and it will produce another set of Species, lets say Species A.2. Until to such point that Species A.9... If Specie A.9 looks very different now to Species A, we therefore can say that you have another species or a speciation has occurred.