No surprise there. Kester and Wemba were never the same after their split in 1982. It is so sad because they were a great duo musically. I heard that they tried to do this even back in the mid 1990s before Papa Wemba ended up doing wakeup album with Koffi Olomide.
That's not true. Kester and Wemba were still visiting each other until the mid-90's and made alot of concerts together. It's just private-life which killed their relation and also the staff who ruined everything when those heavy rivalerly started between Koffi-Wemba-JB-Werra.
People were asking for a duo-album in the early 90's when Emeneya settled in Paris, but there wasn't a label would could pay that project. So then when Wenge's Pentagone was number 1 in 1996, Koffi didn't like it and was looking for a way to break that succes. So he asked Emeneya if they could record a duo-album under Sonodisc. Emeneya accepted it, but on the end refused, because in he's opinion they had to do it with Papa Wemba who made them known to everybody. Which didn't please Koffi, because they were beefing with Papa Wemba at that time. Having then made some interviews with Bolowa Bonzakwa dissing Papa Wemba, sung the song Andrada and started ignoring Wemba on interviews. But then he changed his mind and decided to reconcilated with Wemba. Starting then to gossip about Emeneya towards Wemba. This made Wemba furious and said to Koffi that they will not give Emeneya a shoot-out on that album.