Diego is still there, he has still his shop in Chateau Rouge, but he doesn't produce music and theatre anymore since 5/6 years, because everything is youtube and the production is nowadays mostly done by the artists themselves.
It was Techno Malewa volume 1 that sold more than 50.000 copies, not Mayi ya Sika. Mayi ya Sika was produced by Duo d'Enfer of the late Adrien Mukiadi and his brother Papy Mukiadi, who ended up by being in conflict with Werrason. The money of Malewa is going to him, because he's the excuctive producer. I don't know their contract, but the way Verckys explained it in one video, the recordlabel always get 50% and the rest going to the artist, but the recordlabel can also earn more money if the artist signed a slave contract. For example most artists who signed with Verckys weren't getting royalties of their songs, because they sold are they gave VEVE 100% of the rights in exchange of free instruments. Emeneya used to regret about it, because he couldn't benefit of his songs he released from (1982 until 1986), the same for Bozi, Evoloko and Nyboma.
