It seems you are intentionally trying garble the Evolutionary views of Pro-Evolutionary Christians.
A. Descent from shared ancestral populations of a different species is not eliminated simply because God uses shared anestors as part of Jid method to create speciation.
B. Nor are mutations no longer mutations simply because God uses mutations as part of the process of creating Speciation.
He both you and @JoeG attempt to argue that speciation that involves mutations and NATURAL Selection applied to ancestral populations somehow disqualifies mutations and NATURAL Selection as key elements of the evolutionary processes.