I think the main point was in the "freedom of Ilúvatar", meaning simply that there are some things that are lined, you know, "logically" and for Valar (maybe even from some Wise among Elves or Men) they can be expected from what happens before. You know, something like it is logical that if A leads to B, then when A happens in the history, we will expect B to happen (of course, this is just a very simple scheme, the knowledge of Valar is of course transcending the simple logic of Elves or Men, but they probably also have some sort of "logic"). But there are things that are totally unexpected and can emerge "against logic", because they come from Eru's freedom. For example, I think the most obvious event like this is the emergence of hobbits.
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"Should the story say 'he ate bread,' the dramatic producer can only show 'a piece of bread' according to his taste or fancy, but the hearer of the story will think of bread in general and picture it in some form of his own." -On Fairy-Stories
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