It might be you're friend is confusing a receiver and satellite configuration with a satellites only setup connected directly to the 3GX.
There was supposedly a trick to allow sats only to work by binding them to you're model memory using a seperate receiver first, then plugging them into the 3GX already bound.
However there is one problem I can see with this and that is the failsafe will not be set properly to how the 3GX will then be setup to the model. Ideally after an initial bind, the user would then go through DIR mode to setup the flybarless/gyro parameters, then perform a bind again to set the failsafe correctly. Using the rumoured trick to have sats only working with a DX6i this rebind isn't possible.
Personally I wouldn't even risk it, the chance of the model not being in full control is enough to stop me even trying it. This is not only for the models sake, but that of my own safety and those around me to.
Align do advise that you cannot use a sats only setup with a 6 channel transmitter and I am sure if there was a safe way to avoid this they would have told us.
Team Robbe SchluterUK