I thought Willy Bula left because he had a conflict with Koffi he even refused to participate to the first version of Ultimatum recorded in Kenya in late 1996-early 1997(with vocals of Babia and Eric Tutsi) because of that.
Speaking of Bivens I think he left Quartier Latin at the same time because Koffi prefer the Somono-Mboshi duo and it seems like he was not using him that much after the release of V12.
When did Aladji left Quartier Latin because he have a vocal in Magie it seems like he dissapear after that did he went solo ? Joined another group ? What he is doing now ? Sorry if i'm asking too much questions lol.
About Aladji I don't know....
No, Koffi was disappointed in him after he refused to participate in the V12. It's from there where Koffi lost in him sympathy, which he won for the work in done in Noblesse Oblige and Magie. Willy participated in the Ultimatum-version of Kenya 1996.
Beevans left Quartier Latin in 1998 for Cultura Pays-Vie. I found strange how Koffi dumped Beevans after the work done in Magie and V12 and defending Koffi in all ways during the polemic against Wenge 4x4 and Ekokota. But apparently he could not keep Somono up in creation of new animations and nkisi. Maybe it was a kind of karma, because he bad behaviour against Somono. I remember that Somono said in a interview that Beevans didn't like him when he came in Quartier Latin and said to him in a arrogant way that they couldn't talk to each other since he came freshly from Europe (Magie-era)
here Beevans messing Somono animations up.
one of his last concerts in Quartier Latin. from 5:49 min.