BVS will outsell Deadpool by such a massive amount. Why the hell would Warner give a shit about Deadpool exactly? Unless you are being sarcastic.
I don't think this has anything to do with Deadpool, but why are you making this assumption at this point?
Man of Steel made $291 million in the US and $668 million worldwide. The opening weekend gross was $116 million.
Deadpool has made $241 million in the US to date and is on track to do well over $300 million. It's at $497 million worldwide now and is on track to do well over $600 million worldwide, maybe over $700 million. The opening weekend gross was $152 million (4-day) or $132 million (3-day) depending on which one you want to take.
Deadpool is a movie that outperformed Man of Steel. So I'm not sure if we can really confidently say that BvS will outperform it by a "massive" amount. At this point, all bets are off.