I was looking at my notes and I realized what I had written was kind of stupid. I simply did not understand that the question of the Ri was based on the sages of R. Yehuda; not the first opinion in the teaching on R. Natan, On the other hand I also realized that there is a possible way to answer for R. Tam.That is in two steps. One is that perhaps the Gemara did not want to speculate that the argument between R. Yehuda and the sages is in an alley because that would mean that R. Yehuda would have to say that mesira [handing over] works in an ally even when the owner said "Go and pull." But the Ri could answer that the Gemara is speculating anyway and modifying the sages. So why not modify R Yehuda instead. But there is a more powerful answer for R Tam why the gemara does not want the argument to be in the alley. The reason is because then the statement of R. Yehuda would have to be this: he is moser the object from the alley into the public domain. That is just like the Gemara concludes that the sages have to means he pulls the boat from the public domain into the alley. But then the Ri could answer this. He can answer that in any case to R Tam if Mesira is better than pulling then R. Yehuda can easily say that it works in an alley even without his doing mesira from the alley into the public domain.
But then R. Tam could turn that argument against the Ri and say that if pulling is better than mesira then why does the gemara have to conclude to the sages that he pulled from the public domain into the alley. After all, if pulling is so much better than mesira, then let it be effective in a public domain also!
But then R. Tam could turn that argument against the Ri and say that if pulling is better than mesira then why does the gemara have to conclude to the sages that he pulled from the public domain into the alley. After all, if pulling is so much better than mesira, then let it be effective in a public domain also!