Why leaders always give a different version about their departure after years. Because his musician Oasis and somebody else close to Blaise, said that it was due to JB abandon not visiting him in hospital, giving fake reasons that they were busy with preparing Zenith and TH. Calugi being the only one to visit him in Ngaliema, but being warned by the BCBG-camp and also ended up by not coming anymore and Blaise almost died. Then when he recovered, JB sended people to him to get him back, when working in the studio for Ponderation 8, Blaise then saying that they had to say ..... (insults) to JB and that he won't come anymore.
Blaise said the same thing, that they abandon him in hospital, in I think Paulin Mukendi's show in 1999 and in the same year, he said that he was waiting for BCBG's return and working on an album. Other sources said that he already working on Ponderation 8 at home for the next Europe-tour and JB being mad about it, but not saying anything, just profiting when they came in Abidjan by suspending him after fighting Fi-Carre.
I don't think that Blaise left, because of knowing that JB was about to be dressed like a king, because those things are always knew min. 1 month before the event, while Blaise wasn't coming to concerts and rehearhals anymore since 3/4 months.
The plan of bringing Kibens, Rio, Chai, Heritier (he ended up by getting being left behind, because of his age) and Bidjana (Gentamicine went in his place). Started just before the show at l'Esplanade Palais du Peuple organised by Serge Kasanda where they were presented. Before the show JB had an interview with Mbuyi Bwewe or Mamie Ilela (I don't remember) where JB presented them and said that they would go to Zenith. Blaise Bula wasn't coming anymore at that time, but hadn't officially left.