Explanation #1: Rashi explains that those who suspect (and are strict) by a needle, suspect here as well.

Ramifications: In that case, this is not like the Halachah, since we Paskened like Rebbi Yochanan, who declared it Kasher, earlier.

Explanation #2: It therefore seems that even Rebbi Yochanan relies that it came via the Simponos (the blood-vessels) only in the case of a needle, but not in the case of an olive-pit, which is thick, and cannot easily travel via the blood-vessel, and which we therefore suspect holed the esophagus and went back into the liver.

Clarification: The same applies to Yisre'elim, and the Gemara only mentions Kohanim because the Keivah is given to them.

Reason: This is due to the fact that they would not call them 'people 'who assist the Kohanim', because they did so once,

Clarification: According to Rebbi Yishmael, the Pasuk is not needed to teach us that, since, having commanded them to bless Yisrael, it is obvious that Hash-m agrees with them when they do.

Clarification: Even a Nochri who blesses Yisrael is blessed ...

Source: ... as we learn in the Yerushalmi in B'rachos, where a certain Nochri greeted Rebbi Yishmael, who replied - 'Your reply has already been stated!', meaning that he did not need to return the Nochri's greeting, since it was already contained in the words "And I will bless those who bless you."

Clarification (Part 1): This means that Rebbi Oshaya had a tradition that Rebbi Yishmael permitted it in the name of his fathers ...

Clarification (Part 2): ... but not that he extrapolated it from this Beraisa.

Text: And we do not have the text 'These are the words of Rebbi Yishmael who was quoting his fathers', but rather 'These are the words of Rebbi Yishmael' (period) ...

Proof: ... because we will later switch, and explain that when Rebbi Oshaya said 'in the name of his fathers', he meant that Rebbi Yishmael quoted it in the name of his fathers, but that he himself did not agree with it.

Implied Question: But why does the Gemara then ask 'What does 'she'Amar Mishum Avosav' mean?

Answer: What the Gemara means to ask is 'What is that Beraisa where Rebbi Yishmael permits the Cheilev of the Keivah, and which you say is in the name of his fathers'?

Clarifying Pasuk (Part 1): It was not necessary to insert the Pasuk "es ha'Cheilev ha'Mechaseh es ha'Kerev", since we already include the Cheilev that is on the intestines or the stomach (according to the other opinion) from "ve'es Kol ha'Cheilev asher al ha'Kerev".

Clarifying Pasuk (Part 2): ... and the Torah inserts it to preclude the Cheilev that is on the Dofen (flank), as the Toras Kohanim explains.

Clarification (Part 1): It is not speaking here about a lung which is blocked up by Shuman, or which is stuck to the Shuman ...

Reason: ... which is obviously T'reifah, since this blockage is ineffective, seeing as a lung does not possess fat, in which case the fat is not its own.

Clarification (Part 2): Rather it is speaking here about the intestines which have been holed and are stopped up by the Cheilev of the Kanta (the colon) which belongs to the intestines, since they lie on it all the time, firmly wedged, rendering it an effective blockage.

Clarification (Part 3): Likewise with regard to the Cheilev that is shaped like a hat, and which the Gemara finds necessary to state that it does not block (the heart or the lung), it is speaking about the Tarpash ha'Leiv (the pericardium), as the Gemara will explain there - which is there permanently; whereas the lung has no permanent fat that blocks it).

She'eilah: They asked Rabeinu Yitchak what the Din will be regarding a needle that is found in the craw (the stomach of a bird), where both its bag and the skin have been pierced, but the Shuman above it blocks it.

Resolving the She'eilah: And he permitted it, because, the Gemara's She'eilah here is confined to the Cheilev of a Chayah, where the corresponding Cheilev of a Beheimah is T'reifah; whereas by the Tahor Cheilev of a bird, where we do not find any corresponding fat that is Tamei, it is obvious that it blocks, since it is firmly placed.

Halachah: The Halachah is like Rav Papa. In fact, we can also assume that Rava retracted, since, quoting Rav Nachman, he says a little later that between Chimtza and bar Chimtza, one of them blocks and one of them doesn't.

Question: Like whom does this go, since even the Rabbanan (that the Gemara will quote shortly) only permit five liquids?

Answer: In fact, the Rabbanan permit all liquids, and they only mention those five because Rebbi Shimon disputes them; whereas all other liquids, even he concedes are permitted.