I think that everyone had his own reason. I don't remember who it was (Junior, Jipson or Mirage), the person said that they know that Quartier Latin would die once being back in Kinshasa and that nobody had the intention to go back. But it was not explained why they were thinking like that. Apocalyps once say that he was afraid to receive 12 from Koffi for participating in Droit Chemin, because of the way people started to warn him about what happened to Mboshi in Kinshasa after that Academia got created. Felly Tyson also said something similar in one of his recent interviews. However, I remember reading an article where it was written that Koffi said that they had to stay in Europe and do their best to get papers, because he wouldn't apply for visa's anymore. I don't know if it was the same article, but it was also written that Koffi started to humiliate Ferre in the rehearshal by calling Bouro Mpela, who just rejoined QL, "transfer le plus chère" and other stuff, which angered Ferre and which why he didn't show up to concerts anymore