Came across this interview from last year by Noly Tambu.

Starting at 25 minutes he is asked what happened between their relationship seeing that the Acha Movoto name was very popular around Wenge Musica and later BCBG. He says he doesnt really know what he did wrong for their relationship to go sour but that he is prepared to ask for forgiveness if he is told what he did to Leki naye Mukulu wa Bankulu.

He also says JB even if he is a good person, he has a weakness (lokola Mobutu) of listening a lot to what those around him tell him even if not well intentioned and he (JB) doesn't take the initiative to verify the stories they feed him. Also reveals that at some point BCBG was performing in Paris and when he tried to attend the concert he was stopped by the guys at the gate who were clearly under instructions not to allow him in. Because he could clearly see that as he was at the entrance to the concert the guy at the entrance received a call even though he couldn't tell who was calling him. Further says Koffi Olomide still has his old donors around him who no longer give him any monies but they they still have a good relationship. He wonders what went wrong because he is one of the guys who has the most mabanga with JB. He also says even Papa Wemba before he passed on at some point asked him which group he prefers between Viva La Musica and BCBG and he told Mzee that he prefers BCBG and that everyone knows the affection he has for BCBG. He seems troubled that at some point in the interview he asks the cameraman to turn it away to wipe some tears.

Note: Am not sure of the meaning of some french expressions so i might have missed the context.

 in short somebody else(taty wabela) hijacked his position next to jb by reporting endlessly things about him and jb is somebody who gets pissed quick in such situation so he started ignoring vieux acha,or telling bodyguards not to let him and so on
it went hardcore when before trying to visit jb he visited koffi(at that time jb and koffi had a lot of common friends and donors and both when they falled out where unhappy when "their" donor helped or visited the other) which lead to jb being told that he could be sent on mission by koffi(same stuff happened with sai sai) while vieux asha visited koffi as a lifelong friend/petit
there is also vieux shuami yalolo who was in a kinda similar situation and recently bouboul and co on koffi's side whose fallout started with their visits to jb

Merci Maitre Archos.

How well financially is Vieux Acha at the moment? I ask because i have a feeling that he feels like he is no longer wanted closer to JB because he is not doing well financially. He mentions that is it because am now old that you dont want me around and that comparison with Koffi's friends/donors who no longer give him money but are still close.

possible,quite possible,musicians like doing that a lot,when you see a donor remain for very very long its often quys with a long common background,some of the guys still we koffi studied with him decades ago in france for example
but at the same time vieux acha was one of the biggest victims of the europe concert ban,his business was very directly related to concerts and since he was no longer getting shoutout he got forgotten
thats why some guys like to be on 10+ albums in row of our artists if they can because it brings them more attention and he made the "mistake" to commit too much on only one side