But, and it's a big one, there is one problem with the overall argument made. While the whole evolution argument is sound and I have no trouble accepting it, what I do have an issue with is the concept that there is no overall designer. Yes, I get that there is no blueprint and cells do things on their own, independently of one another, independently of any global picture. So?
There may not be a design an embryo follows. That may be exactly how The Designer designed it.