Its normal that people compare Temoingnage to Kibuisa Mpimpa. Because Temoignange was Werrason's second solo album after Kibuisa Mpimpa.
It was not because of Bill's departure that people don't like Temoignage, it was because of its arrangements. Don't forget that Kibuisa Mpimpa was arranged by Philipe Guez, Al Nzimbi and Djudjuchet Luvengoka. Listen to the arrangements of Tave, Prince Au Congo, Le Grand Monsieur, Destin Ya Moto, Obiang and compare it to those of Temoignange. Also the level of the songs on Temoingnage aren't the same like on Kibuisa Mpimpa. I think they made the mistake to record the album live. On Temoingnage they had Sec Bidens as arranger who also a top arranger like Maika Munan, Al Nzimbi, Souzy Kaseya, Philpe Guez, Djudjuchet, Michel Lorentz, etc. But it looks like Maison Mere didn't took the time to record the album and that they hadn't alot of motivation like on Alerte Generale which I can understand, because they hadn't a real competitor anymore. They already defeated JB Mpiana, Les Marquis didn't exist anymore and people already accepted the new squad with Alerte Generale. So they didn't had to prove themselves anymore.
Temoignage is ok as album, but it need alot of concentration, motivation and enegry to record a live-album. Listen to Sanction of Academia & Titanic of Wenge BCBG.
