In relation to the idea that there might be a connection between Abayee and R. Meir, I would like to mention that there is a hint to this idea in Rav Nachum of the Mir in Bava Mezia page 13. The connection he sees is through the Rif who holds that witnesses cause a document of divorce to be valid by their signature, and he holds with the law of Abaye that witnesses on a document cause the acquisition to the lender immediately. There does seem to be a connection in that the Gemara says that the document is not acquired until it gets into the hands of the lender. However, I was looking to see if perhaps Rav Shach makes such a connection, and did not see it. It occurred to me that the reason is that (I think) the Rambam does not decide the law like Abayee, nor that law of R Meir, and that even if he would, the laws are radically different. The Gemara is saying that Abayee holds the acquisition is caused by the signatures of the witness retroactively from the time they signed. This cannot have a connection with R Meir that holds the witnesses on the divorce (get) make it a valid document, but still the divorce does not happen until it is given into the hands of the woman.