I'm surprised Koffi was jealous, because he's clearly the better singer and had a fairly established name compared to Felix. If I'm not mistaken, Felix lived in Europe and worked a regular job with music as a hobby. At that point, did he even seriously think about a solo career?
It was first a pack of 8 then it moved to 12 and by the time it was about to be more they started to fallout,which is why he still release some of the songs later