I'm pretty sure that's him, and again I'm left wondering: is #9 Ricca, Cerone, or otherwise? Pic was probably from '56-58 or '59, so Ricca would've been available for such a gathering. I'm not sure he would have attended, though. Also,...
I see more brown with grey in the little hair that #9 has, which leads me to guess Cerone. But I have no idea, and can only surmise.
I think that's gotta be 6 of them, and MAYBE 7. Still totally unsure about all but 1-3, 5, 8, and 10. I really hope Fosco puts us out of our misery some day and announces the names, because I don't know if I can take much more of trying to figure it out (and I can't stop myself from trying).
