You're only allowed 2 songs from a pre-order album to chart. That's why Katy's WOA didn't but DH did. I'm not sure if you can choose to swap, though. i.e. When Venus is released, they can choose for DWUW to drop out and Venus to replace it.
Y'all need to calm down. Y'all are really hyped right now about DWUW because it's slaying. Once it drops, y'all are gonna go back to clawing for Venus.
For all we know, Venus could be better than Bad Romance. Just be patient. Writing all these paragraphs isn't going to get Gaga or her team to change their minds about Venus being the second single.