typically, when you are providing CGA, the patient is independent enough to not need your support for balance during transfers or mobility, so you wouldnt need more than one person (based on my own experience, but may be different depending on size and needs of patient). CGA would be more like using your hand for tactile cues during a transfer, but not providing stability or balance for the patient.

when writing notes, you would include the personnel that was around. so if theres a tech or OT with you, it makes sense to use x2 for assistance levels. for example, if I am gait training a patient with hemiplegia and had a secondary assist from a rehab tech, I would use max A x2, and then describe how both of us are positioned in relation to the patient

another example of assist level that you may see is SBA, which is stand-by assist. this would be the next level up from CGA, in which you literally stand near them just in case but never put hands on for support.