I actually very love this theory.
We have so many descriptions of them looking elegant and godlike but when we see Ballas an Nihil they look decayed, cold. Almost like they had been in cryo sleep for far too long.
Maybe the Orokin had Technological Transference and we the Tenno have "Magical" Transference, meaning that they can "possess" technology and we can possess living things.
Maybe they put themselves in cryo stasis during those Transference's? When they visited Mars and other Colonies and Planets. But that makes me wonder why the #*!% they need bodyguards if they have Robot clones who can fight for themselves, or maybe they were just show, they cant fight, only build to look pretty thats why they need bodyguard Warframes and Dax?????
This explains abit why theyre unkillable but still need Kuva to transfer bodys. The metal puppets they transfer into can revive, maybe they got a ripped of version of Oro like the Sentients. But the Orokin bodies still decay, slow ofc, but they still need to transfer to a new body from time to time.