Gould told the truth about Haeckel's precepts. This is not to say Haeckel was evil. I don't know that. I don't know that much about Haeckel beyond this situation. If your idea of evidence is that which you claim as verifiably true in Haeckel's propositions (case), I'm dropping your class. You don't need to "teach me" more.
Your basis for reasoning is gone as far as I am concerned because -- you deny the truth. Either his drawings were correct, or they were not correct. And as you said to me, it truly doesn't matter what you think. The drawings of embryos as yes, he imagined, as having been recapitulated in the womb, were misleading, wrong, and taught as truth for decades. I'm not even up to the fish gills, just the idea that you cannot admit the truth. The drawings are definitely without doubt evidence of his faulty imaginings in that respect. You can say whatever you want about the magnitude of Haeckel's teachings. The true and visible evidence shows his drawings were wrong about recapitulation, again I emphasize, which were taught for years and years as true in the public school system. Either that tells you something about the public school system, or it tells you something about truth not being taught when it is not expedient.