If you lower weight even more, you can run more aero wheels and have a more aero bike while still staying right at the weight limit. Cervelo explains this in their website on the Carbon Soloist SL. Sure, CSC can have a UCI limit bike with the Carbon Soloist by running Zipp Z2's. But with the Carbon Soloist SL, they now can run Zipp 404's and still be at the UCI limit.
__________________
If you notice this notice then you will notice that this notice is not worth noticing.