Isn't it unfair that Miaka has to find her constellations on her own, and in Yui's case her constellations reunited দ্বারা themselves?
That's true. And is due to the differences between the Seiryu's constellations and Suzaku's. It is true that the SHI JIN TENCHI SHO says that the priestess has to find them with her own effort, but in the case of Yui, we could say that it was her energy what brought her constellations together. This could be one of Yui's abilities, but it proof that the power of Seiryu's constellations is huge. It means that their power of feeling the energy of the priestess is much greatest than the Suzaku's constellations. Nakago is so powerfull that the rumor is that he can kill all the Suzaku's seven দ্বারা himself. Seiryu's people have tecniques that exceed the level of humans (in fact, Nakago was drawn দ্বারা Yui's energy). On the other hand, Suzaku's seven don't differ much of common humans, regarding their capacities and way of living. আপনি could even say that they lived unaware of being one of the constellations (this is in part due to, in comparison with Kotou, which is constantly between civil wars, in Konan lived in peace). Therefore, they couldn't feel the energy of the priestess, except for Chichiri, who was the only one who looked for Miaka (chapter 13). There's a much আরো important point to emphasize here: in fact, all members were unconsciously drawn for Miaka. Tamahome run into her when he left his town to earn money and in the end he had to rescue her (he had never left town in his life before). She run across with Hotohori on a parade, and Nuriko appeared soon after because she dressed up like a woman to enter the palace. In Tasuki's case, even though he was on a trip, came back just in time when Miaka arrived. This way, in the end, আপনি could say it happened the same. And in Chiriko's case, he didn't showed up right away due to reasons beyond his control.

Taken from book 8 of F.Y.