[Man in the wall ... possible identity!]

Just gonna leave this here as a note that warframes (at least excal) predate the Ten Zero

 

"A mysterious relic predating tp orokin empire "

 

Note, this is official DE content (not tennogen) taken directly from the descriptions of the proto excal and proto glaive skins (which, like the freyarch and gersemi skins for oberon amd valkyr, respectively, are described as deluxe skins for the objects in question) thus it can safely be assumed the descriptions listed on them are cannon regarding lore. It also supports the argument that warframes existed before the orokin, let alone the VOID-jump (not rift walk, sorry) catastrophe.