[Avodah] How can R' Yochanan and Resh Lakish argue about the tradition of a Gezera Shava?

[Micha Berger]

On Sat, Nov 25, 2017 at 10:27:38PM +0200, Marty Bluke via Avodah wrote:
: The Gemara in Makos(14b) has a dispute between R' Yochanan and Resh Lakish
: which revolves around a gezera shava. R' Yochanan has the gezera shava and
: Resh Lakish does not, Rashi explains that Resh Lakish did not get this
: gezera shava from his rebbeim.
: 
: This seems very difficult because the gemara in Bava Metzia (84a) describes
: how Resh Lakish was the head of a group of bandits and R' Yochanan
: persuaded hm to learn Torah and was clearly Rabo Muvhak...

So, he had a mesorah from a rebbe other than his rebbe muvhaq or any
of his own rabbeim -- maybe just a shiur from someone else he sat in
once... (Which is similar to RHR's #2.)

Or...

If "Moavi velo Mo'avis" was darsehened first by Boaz's court, then we
know of at least one gezeira shava -- from Amon to Moav -- that Boaz
invoked withtout a tradition of its existence dating back from Sinai.

For that matter, if the Rambam assumed that the rule about no new gezeiros
shava really was in place from day one, then he would have to assert that
like [other] halakhos leMoshe miSinai, there couldn't be machloqesin in
any of them. I would therefore deduce from the Rambam's silence in the
face of numerous such machloqesin, he must have thought that gezeiros
shava could be invented (or as other riahonim would have it: discovered)
without a mesorah.

It would seem the idea that GS requires a mesorah has a loophole. Perhaps
the notion is that the textual connection must have a mesorah, but 
the lesson taken from it could be left to the later generation to find.

Also, it is interesting that the contrast in Pesachim 66a to the mesorah
needed for GS is the qal vachomer. A rule of logic that a person truly
could make on their own in a way that doesn't apply to another of the
other midos sheheTorah nidreshes bahen.

Tir'u baTov!
-Micha

-- 
Micha Berger             When faced with a decision ask yourself,
micha at aishdas.org        "How would I decide if it were Ne'ilah now,
http://www.aishdas.org   at the closing moments of Yom Kippur?"
Fax: (270) 514-1507                            - Rav Yisrael Salanter