I fail to see how mondays fixture at the DW would have any impact on the friday. If wigan cant play on monday then the impact would be on that game. Any thing else would cause too much impact.
Follow the logic. Lets say we have widnes on the monday. If we play wigan on monday instead widnes moves to friday. This would impact on their game on friday. Probably against Wire. this would impact on wires other game etc etc until the cirlce is complete of who ever wigan are due to play on monday.
Basically move one game for wigan or move several games until you complete the link with whoever plays wigan on the monday.
The RFL have enough problems planning at the best of times.