The name of the solist is Nzau
The guy dancing next to Montana Kamenga is Jirbo Ntuta. When Defao was busy with touring in USA, he brought Jirbo Ntuta last minute in, because of the tensions within his band (wanting to have someone to support him) and some musicians already having left Big Stars in Canada because of anger. When Big Stars disbanded in Switerland, Jirbo went back to US and teamed up with Soukous Stars. He toured several times with them in the US and also recorded some albums.
After that he went to Kinshasa to form his own band Maison Blanche having 4 coups (aka Pepic Mbasu) as atalaku, the guy who animated the mbasi cri in koffi's generique swi
After that I don't know happened to him. But it looks like he got deported from the US. After some years he tried to relaunch his music-career in Mozambique.
He came to Paris two years ago to finish his album. I don't know if it already got out. He released last year a single with Didier Lacoste. He also made an interview with Teddy Mola about his time in Big Stars