If the din were at the Pleiades, even then a person from Persia would have taken hold of it, or one amongst the Persian descent would have surely found it.
قَالَ رَسُولُ اللَّهِ ﷺ لَوْ كَانَ الدِّينُ عِنْدَ الثُّرَيَّا لَذَهَبَ بِهِ رَجُلٌ مِنْ فَارِسَ أَوْ قَالَ مِنْ أَبْنَاءِ فَارِسَ حَتَّى يَتَنَاوَلَهُ