So, all the members of the order arrive without a problem. They use Disillusionment charms to seem almost invisible. Would this not be a better strategy for getting Harry back. It would be a lot more difficult for the Death Eaters to see them especially at night. They would also be unable to see the defining features of people to see which one is Harry. I understand that this is a spell, and Harry is underage, however, the order uses a counter spell to reverse the effects when they arrive to no consequence.
Another idea, why doesn't Harry just take the polyjuice potion and become one of the order? Isn't it better to have no one looking like Harry.
Thoughts?