jbaldy22: “shavous and matan torah have nothing to do with each other according to the Rivash”
Benignuman: “I think you are overstating the Rivash. . . .”
jbaldy22: “so shavous doesnt have to coincide with matan torah yet it is about matan torah – would love to hear you explain that one. Obviously there is some sort of connection that it is in the same time frame but according to the rivash it is clear that shavous is a separate inyan from matan torah.”
So they do have something to do with each other and you were overstating the case.
I agree however that the Rivash’s explanation implies that there are aspects of Shavuos other than Matan Torah. All 3 of the regalim have both a historical basis and an agricultural basis. What I think you can derive from the Rivash is that with respect to Shavuos the agricultural basis trumps the historical basis.