Thanks for the clarification Edward.
I just figured that the S24 with an additional wing will give you the same amount of faders as on the S48. Given that the processor is the same (and therefore capable of the 96 fixtures), I don't really see any reason why the console should not be able to extend the fixture cound to 96 by adding the wing.
This would be a really neat option: giving you the flexiblitiy to use the small S24 for smaller shows and optionally popping in the extension wing in case you are running the full rig for fixtures 49 thru 96.
Guess the S24 is out of the game then.
Again, thanks for your explanations.
Cheers