Perhaps the SP could still go up x4 times in Oct if Dec future...

Perhaps the SP could still go up x4 times in Oct if Dec future is $ 40 but it will be like the SP moving from 0,1 to 0,4. So the NAV/SP could still deliver that growth factor but not before hitting the floor in the scenario where the GAP between two consecutive months future trades is massive and it trigger a massive countergo effect. As the trades are happening in fixed days.