I mean Sam and Koffi had a special relationship, Koffi was trying to get him for a while until he joined, even going as far as calling him “President”, I don’t recall any leader calling their own musicians leader. Sam had good work rate too and was relieving a lot of pressure from Koffi’s shoulders.
Come to think about it out of anyone from QL alumni that could’ve challenged Fally in solo career I honestly think it would’ve been Sam, but Fally and Sam aren’t from the same generation, but if they were they could’ve have had an interesting musical rivalry.