I don't know why anyone would be expecting an improvement on netcode. More than likely, you'd have to have built a solid netcode from the start. I highly doubt they can make it good just through patches. Better, sure, but not good.
I love that nickname so much, lol.
He was still cut from DOA2, being added in a later re-release doesn't change the past.
Ein and Leon are in DOA5U, but that doesn't change the fact that they were cut from DOA5.