Great post EMIT
The other thing people should remember that the Green Dot speed displayed on the MCDU perf takeoff page is calculated using the TOW in the MCDU init-b Page.
If you press F9 on the LPC then it generates a Perf takeoff page with a Green Dot speed calculated usig the TOW entered in the LPC.
Assuming your loadsheet too MCDU check is water tight, the Green Dot speeds must be the same. IF NOT WHY?????? This is if you use 1 or 10 laptops.