Never mind. After a brief investigation, I think that I found the reason.
Girls and boys, stop worrying about the sales. If it's meant to be then Cheers will go to #1.
Sometimes the charts aren't so important and Rihanna co-signs that. She wouldn't release CKB, MD and RR101 if she was only after these number 1's.
Edit: I wanted to add something to my post. IMO PUK deserves the most the number one spot. After that I would like both You and I and Cheers to reign. It would be perfect that way.
Im sure RiRi and Def Jam got something up there sleeve. There not gonna pass on a possible #1 if it keeps gaining. But I think it can make it to the top on its own.
hilarious