You didn't poke holes in anything. You just conflated the argument.
"I'm still waiting for someone to prove that life begins at conception, myself..."
I proved that life began at conception, due to cell theory. Point blank.
Then you asked, "explain to me why pro-lifers eat...anything, really. Can't think of a human-metabolizable food that isn't cell-derived."
Which means, what? It seems to me you tried to make a claim that if cell-theory states that an ovum is considered "life," all cells/all life is created equal. Which is silly. I don't know a rational person who believes that birds aren't alive, or who believes birds' lives are worth as much as human ones.
Then we talked about cancer cells, and immortal cell lines, and the lines got fuzzier. So, I attempted to clarify my position, as the scope of the conversation got wider, in order to account for one of the greatest ethical dilemmas of the modern era.
Life begins at conception because of cell theory. The human right to live, HeLa cells vs. ovums, sentience vs. lump are all part of an argument past the simple definition of "life."
Unless you'd like to have a conversation about the Miller-Urey experiment and the "primordial soup," we should set boundaries on just what the !@#$ we're talking about.