I heard before (I think in the name of the Rogatchover) that there is one Amora in every masechta of Talmud that does not appear in any other masechta.
Is there a source for this, and is there a list somewhere of each masechta's unique Amora?
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The attribution to the Rogetchover is, according to Rabbi Bechhofer, "an unverified legend related in the Yeshiva world."
Something very much like this was written by the Meiri in his introduction to Pirkei Avos (starting here), where he goes through each Masechta listing all of the tannaim that appear there for the first time.