I have heard that the Baal Koreh represents Moshe Rabbeinu like at matan torah. Does anybody have a source for that idea?
This Yerushalmi (Megillah perek 4, halacha 1) that Double AA cited tells a fascinating story. In it, Rav Shmuel bar Rav Yitzchak visits a shul and witnesses keriat haTorah in which the reader is “leaning on a post.” He claims that “This posture is forbidden, just as it was delivered at Sinai in a manner which instigated fear and trembling, so must it be rendered in public in a manner which evinces awe.” (Translation taken from a shiur by Rav Moshe Taragin).
Clearly, our keriat hatorah is seen as a recreation and reenactment of the experience of Maamad Har Sinai and the original Kabbalat Hatorah. Therefore, it would make a lot of sense that the Baal Koreh today is seen kivyachol like Moshe, because he is revealing the Torah to us thru his keriah, as Moshe did.