Thanks. I did find one in there that helps to explain it a little.....
Notice the pin of the rear mode fork is in the valley of the true neutral plate (A). This is the dip in the plate that allows the main shaft gear selector fork to drop to the position to allow the selector ring (B) to drop down below the front output chain drive gear (C). You see in the pic at (D) the ring is just below the gear. This allows this gear to spin freely on the shaft.
Without the dip in the plate, the ring would sit higher and cause it to be connected to the gears below it, thus spinning with them because the rear drive shaft is spinning the main shaft and those gears are directly connected to the shaft. Gear (C) spins freely on the shaft.
The pin in the slot of the plate (not visible in this pic) has not changed. It still dosconnects the transmission from the transfer case.
Does that make sense?