That is correct. I can only connect the ST-i as a guider.
P.S. One reaosn for going with SGPro is that it is one of few/only applications that will convert Canon Raw files to FITS automatically.
Bad news - I am unable to get SGP to connect to the ST-i as the imaging camera.Did you mean you couldn't connect the ST-i as CCDSoft's main camera? Because that's what I thought you were asking.
Anyway, I'm glad you were able to get your 6D to work with SGPro. Just make sure to select FITS format file output and not RAW.