My problem is that Eder Uomo & Spino Ladjatence didn't have more space on that album, they had only 1 or 2 vocals. Especially Spino, in Affaire Tonya Tonya he had only 1 vocal in Kayembe, in Mouna he had only 2 vocals. But in QL he had more space in Attentat (Victoire, Number One, Caméléon, Nul n'est parfait, Malanda Ngombe & Kamutshima).
About the 4 tenorists (Guejo, Fila, Pompom Miyake & Cedar Amisi who just left Wenge Kumbela) was not special like Manda & JB in Kalayi Boeing. With Emeneya had 4 vocals (Lundi, Embouteillages, 7 sur 7 & Tapis Rouge). Don't forget it was a bandalbum.