This statement demonstrates your lack of any understanding of the subject matter you have chosen to champion. It would take an essay to address all the misconceptions you appear to have regarding evolution. Let me just try to help with what I perceive as your most significant misconception.
No organism living today or ever has an “A” ancestor. It is an error to talk about “the” ancestor of any living thing. It would be correct to talk about “an” ancestor or “one of the millions” of ancestors of an organism. That is to say you, and I, and every living thing today has tens of millions if not billions of ancestors.
E.g. I have an ancestor in common with all humans, another in common with all hominids, another with all apes, with all monkeys, with all primates, all mammals, with all amniotes, with all tetrapods, all chordates, all animals (including fleas), all eukaryotes, all karyotes, etc. And literally millions of ancestors between all these.
Your understanding, and by extension your entire line of reasoning, is invalid on this basis alone. I don’t see any point in addressing your additional misconceptions if we can’t get past this one.