Three interpretations, one Mishna TB Pesakhim 84

The first Mishna on today’s daf TB Pesakhim 84 discusses specific parts of the korban Pesakh. Nevertheless, the intent of the first Mishna is not clear even with Rava’s explanation 

“MISHNA: Anything that is fit to be eaten in an adult ox, whose bones have fully hardened, may be eaten in a young kid. And the soft ends of the ribs and the cartilage are soft enough to be considered edible and may therefore be eaten from the Paschal lamb.” (Sefaria.org translation) In the Gemara “Rava said: The mishna teaches employing the style: What are they, in which the mishna establishes a principle and then provides detail, and this is what it is teaching: Anything that is fit to be eaten in an adult ox through cooking may be eaten in a young kid through roasting, even if this part of an adult ox cannot be made edible through roasting. And what are these parts? They are the ends of the ribs and the cartilage.” (Sefaria.org translation)

There are three different interpretations what law this Mishna comes to teach us. One must eat an  olive bulk size amount of the korban Pesakh in order to fulfill one’s obligation. According to Rashi this Mishna comes to teach us that anything called meat in an adult ox is called meat in either the lamb or the young goat and can fulfill his/her Passover obligation when roasted. Without our Mishna you might incorrectly think that the ends of the ribs and the cartilage are not meat.

According to Rambam, the Mishna like the next Mishna deals with breaking bone which is forbidden by the Torah as it is written “... nor shall you break a bone of it.” (Exodus 12:26) Everything of the adult ox that is eaten through cooking is not called a bone; consequently, when eating these parts of the korban Pesakh, one may chew it and even break it and not violate the above verse. 

Finally, according to Raavad, Rabbi Avraham be David, the Mishna deals with laws of leftovers, notar-נותר. If the part of the adult animal is considered meat then the same part in the korban Pesakh is considered meat and it’s leftover must be burned on the first week day according to the laws of notar.

Personally, I don’t see that these three interpretations are mutually exclusive.