I believe a third or more of the rares never resurfaced after the playtesting periods
Four of the Five Flip 'Walkers Tamiyo, Inquisitive Student // Tamiyo, Seasoned Scholar, Ajani, Nacatl Pariah // Ajani, Nacatl Avenger, Ral, Monsoon Mage // Ral, Leyline Prodigy, and Sorin of House Markov // Sorin, Ravenous Neonate have all been seeing a considerable amount of play, with Tamiyo, Ajani, and Ral basically being format staples and finding homes in Tier 1 decks
This confusion is understandable, as Wizards doesnt usually release products seemingly from the same set months apart from one another
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Most decks will favour the latter and even if it isn't technically better I still think people are predisposed to favouring drawing themselves for a multitude of reasons