It's not a dumb question actually, cause that how I'm going to run my feed for the turbo. If you use a sandwich plate for oil, it can only be used as a feed because it is under pressure, so if you were to hook a return line to it, oil would go in it, not out it, resulting in two oil feeds which would be a huge disaster.
The return placement has to be somewhere on the motor where the oil is going to be in free fall, and not under pressure. The only area that oil isn't under pressure, is the oil pan and right above it, the windage tray.
The windage on a msp is actually how the oil goes back into the motor stock, it already has a fitting in it for the oil return line. This windage tray doesn't have a tap in the same place as the msp, but it is using the same idea/concept.