Finwe, I think your timing is inaccurate concerning Frodo's wounding with the Morgul blade on Weathertop happening at the same time that Gandalf is imprisoned atop Orthanc.
Recall that Aragorn found a stone on Weathertop in a place of recent fire. It had been scratched underneath with what may have been the G rune and 3 strokes. Aragorn speculated it meant Gandalf had been there on October 3, and was in haste or straits not to leave more information. That coincided with great lights or lightning the travelers had seen from a distance on that same date, three days earlier en route from Bree.
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For I was talking aloud to myself. A habit of the old: they choose the wisest person present to speak to; the long explanations needed by the young are wearying. -Gandalf, The Two Towers
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