According to R' Shimon Berebbi, who says Rebbi learned a sugya of Yitzeas Mitrayim in order to say Yitzeas Mitrayim in the right time, why was Rebbi "chozer vakoreh". It seems that Rebbi was chozer vakoreh after the zman which all he got sechar for is "kekoreh batorah". The whole reason he didn't say it bzman was because he was learning. Why bother saying later?
Shmuel Teichman, Brooklyn NY, USA
Your interpretation of the Gemarah seems to tally with that of Tosfos ha'Rosh. I suppose that he then repeated the Sh'ma, even though as you say, he wasn't really Yotzei, because he wanted to say the Sh'ma for what it contains, since there is so much to learn from it.
The Shitah Mekubetzes however, explains that he repeated the Sh'ma in order to fulfill the Mitzvah mi'de'Rabbanan of saying all three Parshiyos, only the Gemara asks what the point of repeating the third paragraph, seeing as he had already fulfilled the Mitzvah of mentioning the exodus?
The Gemarah therefore answers that he wanted to recite Parshas Tzitzis at the time of the Sh'ma (meaning together with the Sh'ma, as one always does). And this explanation seems to be the one to which Rashi prescribes, too.
R. Eliezer Chrysler