[RichardJ]

>>I have seen a few of these newer compressors being run with only one belt,<<

I haven't seen a setup in a long time that ran more that one belt. I don't know what your setup looks like so I don't know how I could be of help.

Sanden advises that when using one belt only, you should use the outer groove.
Sanden compressors aren't that power hungry to need more than one belt. Only the old V-twin Mopar compressors come to mind that always used two belts.

Most accessories do well when you have around 180* of belt contact on the driven pulley. Less than that and the belt has to be too tight.

Vintage Air belt diagrams for 6-cyl are very problematic.

Diagram 2 will drive the compressor, but the water pump/fan pulley is only making about 70* contact with the belt, The pump/fan pulley will slip and scream like crazy. The Alt belt needs to go around the crank and pump/fan pulley.

Diagram 1 has two belts on the pump/fan pulley with about 70* plus 80* of contact and together they provide enough friction for the pump/fan pulley. The Alt has a double pulley, not because it needs it, but because the path of the pump belt interferes with the alt location. Cheaper and easier than adding an idler pulley to alter the path.
The crank pulley for the Alt is smaller than the crank pulley for the PS pump. This will cause the belt speeds to be different as they pass around the double Alt pulley and those belts will scream forever.

I'm not sure what question your PM is wanting me to answer, but the Vintage Air diagrams are a primer on what not to do.