oooohhhhh!
--
which split are you talking about, by the way? As with scenes in New York, though players might have shared concert bills and known one another, not everybody played together.
the Mechali brothers played with almost everybody, as did Siegfried Kessler, Patricio and Manuel Villaroel, Jef Sicard, Michel Gladieux, and Jean-My Truong, etc.. It was a fertile time with a lot of musicians testing the waters.
Portal, Vitet, Guerin, and Tusques were a bit older, and I think part of a more established "professional" crew -- Portal was versatile in the Western classical field as well, while Vitet and Tusques came up in the post-bop environment. Tusques was also deeply politically involved with the left, so that might've been part of it too. Thollot was young but also came up among the straight ahead scene as a teenager.