I think the demand level was probably what mattered - as I understand it Schneider could produce small batches of lenses without a lengthy pre-order period - which in an era before more automated just-in-time manufacturing was probably a key aspect in what was probably a gently declining marketplace for the Focomat models. Further to this, I wonder to what extent Leitz made large batches of key optical/ mechanical components in one go & when they ran out of parts to assemble after a number of years (the long tail of the market for the Focomat IC design?), switched to a deal with Schneider that better suited the demand levels of the later years of the IC?
I think you could see it correctly here, but it will always be a guess. Leitz sold more than 60.000 first version Focotars 50mm before they turned to Schneider for the 2nd version. Perhaps Leitz was already designing the Focotar-2 then, but weren't ready yet to put it on the market. I have always felt the Schneider Focotar was an in-between action. That turned out to be very good ! Chip is right about that.
The only one of those that I've heard of in the context of a Schneider connection was the Focotar-2 100mm, though it's never been clear to what if any extent that went to - I wonder whether people assumed it must be a badge engineered Componon because of identical aperture & focal length. Or perhaps Schneider supplied optical subassemblies/ components & Leitz assembled them, which given the Portugal plant & the relationship with Minolta on a not dissimilar basis in the same time period would not be altogether surprising.
I have nothing to proof this, but I am convinced Leitz designed and produced both Focotar-2 lenses, the 50mm and the 100mm.
Changing topic slightly, what's the 100mm V-Elmar's performance like?