Its more a question of what is more or less likely. Its likely that Sah (sAH, 'Orion'), 'father of the gods' in the earliest PTs, was the personification of the large distinctive constellation of Orion, and Sopdet (spdt, 'Sirius') the personification of Sirius, the brightest star in their sky after the sun.
Its also likely these two stellar deities, who were paired together, were known much earlier than the earliest PTs from the end of Dyn 5. After all, Orion and Sirius were crossing the southern part of the sky throughout AE history - they did not just suddenly appear in the sky at the end of Dyn 5, and bearing in mind the overwhelming evidence for the royal funerary / afterlife beliefs that had a significant celestial content, including stars, from very early on in their history, it seems reasonable to infer that Orion and Sirius were recognized.
It's highly unlikely the iconography of the King fallen upon his side from the 2nd Dynasty seals will ever lend itself to support for the identification of Sah as Orion, rather it would nullify it...might as well keep quoting the old Theosophy then, Sirius=Isis-Sopdet, Orion=Horus/Osiris, here's a dollop for those unwilling or unable to move on.
Orion (Greek) A handsome giant and mighty hunter of Boeotia, who was placed among the stars. The constellation Orion was regarded as a giant not only in Greece but in Syria, Arabia, and Palestine; in Ireland and among the Mayas it is a warrior; in Egypt it is identified with Horus, the young sun, in the solar boat; and in Babylonia with Merodach, or Nimrod the mighty hunter.
Sirius. It was 'Isis in the heaven' and called Isis-Sothis, for Isis was 'in the constellation of the dog,' as is declared on her monuments. 'The soul of Osiris was believed to reside in a personage who walks with great steps in front of sothis, sceptre in hand and a whip upon his shoulder.' Sirius is also Anubis, and is directly connected with the ring "Pass me not'; it is, moreover, identical with Mithra, the Persian Mystery god, and with Horus and even Hathor, called sometimes the goddess Sothis. Being connected with the Pyramid, Sirius was, therefore, connected with the initiations which took place in it. A temple to Sirius-Sothis once existed within the great temple of Denderah. To sum up, all religions are not, as Dufeu, the French Egyptologist, sought to prove, derived from Sirius, the god-star, but Sirius-Sothis is certainly found in connection with every religion of antiquity"
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www.theosociety.org]
Morph