"Rihanna says she wants whats going on in the club, and I was what's going on in the club, they were like we wanna see what you come out with. So I had gave her three records, one was like a bridge and like stadium music and the 808s, another one was like all the way left, just like a whole new sound, and the other one was 'Pour It Up.'" Mike WiLL continued, revealing that Chris Brown encouraged Rih Rih to choose the latter, "Ended up,Chris Brown came to the studio and he heard 'Pour It Up' and he instantly was like, 'yo what's this? I'm about to tell babygirl she needa listen to this, if she don't like it, I want this to be my single, I'ma record it tonight and put it out tomorrow."
Wow Another song that Chris is responsible for. The gift that keeps on giving
Anyway, PIU was made with her in mind since the beginning. Chris merely helped her choose the one that made the final cut. But, the article clearly infers it was always meant to be HER song since production. The song itself wasn't Chris's idea, just merely which song was chosen was his idea.