Africa N1 hadn't the same impact anymore and MCM Africa didn't exist anymore and became Trace, them not broadcasting full generiques like MCM Africa used to do, which was killing it a little bit. Werrason was more focused in having succes in Kinshasa/Brazzaville and performing in mythic halls of Paris. Another thing is that Werrason didn't had a proper management for Francophone Africa, like Koffi had when being signed with Sonodisc. However Werrason kept getting Kora's (two in 2004 and one in 2005).
Another thing is that because of Werra's limitations in French and not having a strong staff like that of Koffi, he isn't able to make friends with the elite over those countries there. Like for example, Koffi was a big friend of Hamed Bakayoko. This made Koffi automatically being invited by his company Mayama Production to perform in Ivory Coast when releasing a new album of finishing an Europe-tour. However, in other countries like Cameroon, Benin, Mali and Burkina Faso where he had a huge fanbase, he was at some point not coming anymore because of lawsuits, scandals and not having someone like Bakayoko to defend him. Back in 2007, Koffi was about to get arrested in Ivory Coast but Hamed Bakayoko helped him to escape the country and returned the next year back without problem.
Blaise Bula also became good friends with Hamed Bakayoko when coming there in 1997 and 1998 with Wenge. It was the same Hamed who financially helped him with Ponderation 8, Blaise Bula dedicated the song Nostalgie to his radio "Radio Nostalgie" and not sure if he also went with band there. If Blaise Bula had the same succes like JB, then would have performed in Ivory Coast every year like Koffi.
Werrason had only good contact with the late Edith Lucie "Titho" Sassou-Nguesso who was the wife of president Omar Bongo and a huge WMM fan, which made him since Solola Bien performing in Gabon every year until her death. They even made a song for her husband Omar Bongo in Temoignage called Na Touché featering legend Jacob Desvarieaux (RIP) guitarist/singer of Kassav.
Apart, Zambia and Zimbabwe where Werra's succes is bigger than Francophone Africa, Werra only went to Togo in 2006 in the period of 2003-2009 (I don't count Angola, Brazza and Gabon). That tour didn't go well, the music promoter running away, Werra abandoning his musicians and them going to Kinshasa on their own. I think that it was that trip where Lacoste earned the nickname "Mvuama" because of paying tickets for 5 musicians to return back to Kinshasa
About Stade de France. I think that he had a chance after releasing his solo-album Arche de Noe of 2012/13 that never came or a group album after it, every thing would depend on Techno Malewa Suite et Fin. The album wasn't received well because of combattants and people being focused elections. Soyons Serieux also flopped for those reasons. It's sad because Werrason made a strong back with Techno Malewa volume 1, after a difficult 2008, Temps Present which was so/so. We have a huge community in Europe and promotion for 6 months/1 year could make it possible. Preparing such shows also go in small steps. Like for example Koffi who first did Olympia and Zenith in 1999, then Bercy in 2000 and wanting to perform at Parc des Princes in 2001. Fally once wrote on his skyblog something like that, that his next show would be at Bercy and having a question-mark behind Stade de France.