Haleivi: You missed the point of the OP’s question. d’pligi rabanan is refering to shas veston and therefore can only be r’dosa according to second explanation in the gemara. It is a good question and tosafos does not address it. It seems that at this point the gemara is not getting into the two leshonos, and dpligi rabanan means whoever is the author of the braisa, which would depend on the two leshonos.
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