Sorry to sound harsh on this, but I agree with ChipRich's sentiments on this.
This game is defined by the very 'black and white' way in which the rules are applied. No ifs or buts. If you fail on any of the criteria then you're out.
I don't see any difference between this and someone missing the 12pm deadline, or picking a non-3pm kickoff, and then correcting it between midday and 3pm, so presumably that will now oblige you to give everyone a mulligan when they make a mistake of that kind.
Sorry, but it makes a mockery of your rules to let pizzled back in. I don't feel great for saying so, but I think it opens the floodgates for more arguments down the line if you do this.
6. If your game is postponed then you will be eliminated. To avoid this, send multiple, ordered, selections. As many as it takes to guarantee a selection. If more than 10 games are called off the game week is cancelled automatically.