I wonder if Werrason would still have introduced Heritier Wantanabe and push alot like he did after Kibuisa Mpimpa if Didier Lacoste didn't go to Wenge Tonya Tonya. I see like Lacoste's departure created some space for him.

yeah indeed,it was a golden opportunity for him, some of the guys interpreted his vocals in kibuisa already(for example ferre's blandine vocal is a heritier vocal he was doing in duet with kibens in bcbg which he took to maison mere)
i'd say lacoste and adjani helped him indirectly,if lacoste remained it would have been lacoste ferre adjani aimelia plus heritier,5 tenorists so since lacoste left and adjani started to go missing heritier could easily slot alongside ferre and aimelia ,he was also lucky that ferre liked him a lot so he was letting him exist even on old wenge 4X4 songs