I think you're all getting confused here. Did everyone just forget about the 2 month writing camp Rihanna held for her album during the summer? Weren't there like 20 threads bitching about it every other day
?
EVERYONE was there, but he wasn't. Either because he wasn't invited or because his schedule didn't fit. Either way, it's clear he wasn't planned to be on the album, even if she said he should do something for it.