His parents and/or clansmen seems unlikely considering the way Orochimaru and Sasuke refer to them (in japanese the term they use is rather rude).
The Hokage of old make sense but as you said they would need to be summoned out of the Shinigami first.
The 2 remaining Elders could work as far as the truth goes but there is no reason for the scroll and Orochimaru so it's very unlikely as well.
Perhaps the 2 sons of the 1st Rikudou who represent the start of this conflict but they don't have much to do with the village.
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