The only time you Genlock a Catalyst is if you output the Catalyst into a converter scaler such as an image pro. Then, in that case, you genlock the scaler, not the Catalyst machine.

Input sources into Catalyst should be genlocked to the system if they are in the system but if they are run directly into Catalyst then they can be freerun.

I'm doing this exact thing now on a tour.
Cameras feed into the router and switch where they are genlocked. The router is patched to the Catalyst inputs. The Catalysts are run into ImagePro HDs freerun and the ImagePros are then genlocked into the Swicth/router where I can run them to record, IMAG, and the scenic projectors/LEDs.