It was a big mistake of Willy Bula to leave Zaiko before the release of Poison. His song Revelation was a huge succes. I remember Nyoka Longo being angry that he left with him removing Revelation from the second stock of Poison.
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I don't think that Willy Bula would succeed as solo artist in that time, because he had not a big fanbase like JB Mpiana in 1990, Werrason in 1993, Ferre in 2004 or Alain Mpela in 2003. It was difficult to succeed as solo artist in that era, because there weren't in Kinshasa based labels anymore like in the '80s and '70s (VEVE, Parions, etc.), who were supporting youngsters. Otherwise bands like Promise Musica, Kibinda Nkoy, SVP La Gamme, etc. would have succeed and take over Wenge Musica's place, like Wenge did to Victoria Eleison in 1989. Don't forget that from november 1998 it was start of the 'Carre Magique'-era. Felix Wazekwa was the only solo artist in that time that succeed. Do Akongo who started to have fame when Koffi left him behind for Bercy had a talented band with Eboa Lotin, Nono Fudji, Bidjana, etc. and started tprecord a album, which was one of the most awaited albums in 2000, but was not able to succeed and could also not return in Europe, because they said some bad things to the embassies to kill his career. Bendoson who was seen as a big leader started a band with Ramazani, Pompom Miyake, Christian na Nzenze and Azoze na Mbonda. They were blessed by Emeneya, started to record an album and had concerts with huge crowds, but didn't succeed. And so are many examples (Blaise Bula, Manda Chante, etc.)