Summations Only

And since Einstein was never wrong about the cosmological constant we should take his opinions on it as gospel ... oh, wait.

One way or the other, Einstein was completely wrong about the cosmological constant. We know this because he confidently asserted two completely different opinions about it. So it would be a bit strange to do as you have done, and quote him as the definitive authority on the cosmological constant, when we know that he is famous for being wrong about this subject. First he thought it was non-zero, then observational evidence compelled him to think it was zero, and now after he's dead more observational evidence has come along that would convince him that it was non-zero if he was alive, and then you want to rebut the actual evidence by saying: "Einstein himself thought ...", when the one thing we know for certain about Einstein's opinions on this subject is that half the time he must have been completely wrong about it.