Quote:
Originally Posted by Sunder the Gold
As said, Chrono could take over as Fate's support in that first fight. Plus, why search the library now for information on the Book, when we can assume someone else already did that in the last ten years? They knew it was coming back, after all.
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Try to find information from the net without a search engine. You know it is there, but it is incredibly difficult to find it. Yuuno brought Google to the table. If you have Chrono do it, then you break a few things. They would have (or should have) known the book's true name before then, and the fact that it was broken and corrupted. This information might have helped Nanoha and Fate much earlier, when confronting the Wolkies. It started to help in episode... 9, I think. But the Lieze twins interrupted it. As you noted, Vita had already realized they were forgetting some things, and the information might have helped make them stand down earlier.
In short, some things needed to wait until later, otherwise the plot could have been wrapped up sooner. Or at least required clunkier explanations and contrivances to keep the Wolkies as antagonists.
On a last note, Yuuno's addition to the library was also more of a setup for future things, like translating the prophecy that led to the creation of RF6.