Implied question: He could have asked from the Reisha [of the Mishnah cited], which teaches "Ona'ah does not apply to the following matters - slaves, land..." This implies that Ona'ah applies to other matters!

Answer: We could have rejected that it is like R. Yehudah [who says that the price proves what he bought].

Implied question: From here, we can challenge Rav, who said in Kidushin (46b) regarding one who was Mekadesh his sister, that a man knows that Kidushin cannot take effect on his sister, and he resolved to give to her for the sake of a deposit!

Answer (Rivam): (We cannot challenge Rav.) There, it does not take effect at all. Here, regarding the yoke, the sale stands;

It is unreasonable to say that he does not return the value of the yoke, and the remainder he returns.

Question: This answer does not apply in Bava Metzi'a (63b) regarding one who borrowed money from his friend, and [the borrower] received more than he was supposed to;

If the excess is an amount that cannot be a mistake (it is not a multiple of ten or five), he need not return it. I say that [the lender] gave a gift!

Answer #1: There, we cannot say that it is a deposit, for [the lender] does not know that [the borrower] will count it;

Answer #2: Also, even if he knows [that the borrower will count it], presumably, since he did not inform him that there is extra, he does not intend to demand it back.

Explanation: [Nachum agrees with] Rabanan that he did not acquire.

Limitation: This is only regarding bags (for loads) and a saddle for women. However, a [man's] saddle and blanket, even if they are not on it, he acquired them, for they are accessories of a donkey, and he acquired them, wherever they are.

Remark: Rashi did not explain like this. (Rather, even a saddle and blanket, he acquires only if they are on it.)

Observation: We could have said "or perhaps they argue about both of these."

Alternative text: [Some texts say] "doesn't R. Yehudah explain Nachum's reason? No, R. Yehudah says his own reasoning";

Explanation: Isn't it true that R. Yehudah heard that Nachum does not distinguish, when the Kelim are on [the donkey], between when he said "this donkey of yours" and "this is your donkey"? Rather, he always acquires when they are on it;

Explanation #1: R. Yehudah said to [Nachum] that there is a difference between them.

Explanation #2: R. Yehudah truly explains Nachum's reason. They do not argue.

Implied question: They do not literally say the same matter. Their opinions are not the same!

Answer: Rather, it means that they are one outlook.

Support: We find like this in Yevamos (51b) "all of them hold that Ma'amar (Kidushei Yevamah mid'Rabanan) acquires a total Kinyan" (and the opinions differ).