They didn't release an album when Djouna was around. Lofombo is a sound-engineer so its normal that he mixed the album. He helped with the production of Confirmation, because their producer (Rigo Makengo) wasn't really able to promote their album well. If they had still Somina Nadim as producer (was very dissapointed when Djouna left) then it would have been a different story.
It was himself Lofombo who made Djouna the president of Delta Force. Djouna didn't want to do music anymore and was staying at home for weeks not knowing what to do. Lofombo was about to join Big Stars, but those musicians of Delta Force were following everywhere since that they didn't want them in Empire Bakuba. So Lofombo decided to form a band, but he didn't had money and didn't believe that they would succeed. So he contacted Djouna Mumbafu, because he knew that he had some money, alot of connections who could support the band and had some charisma. Djuna Mumbafu accepted Lofombo's offer and they started to recruit some other musicans to complete the band (Ile de Camboge, Bruno Nsona, Serge Liaki, etc.). Then when the fame came, Lofombo couldn't handle that all credits went to Djouna Mumbafu and the people close to him were making it worser by saying things like "how can Djouna become your president while you did everything, etc." with all misunderstanding starting from then. Until that Delta Force split after 6 months or something like that while they were about to go Europe and preparing their album. Lofombo said 10 years ago that he didn't like the way Djouna become the new Pepe Kalle and himself staying Lofombo adding that it was a big mistake to make Djouna the president.
For me Lofombo had just to accept Djouna to be the president. I'm sure that they would have been very far.