Talk:Story and History/@comment-26286858-20150414030810/@comment-86.89.4.191-20150430113322

The Stalker reffers to himself as a lower Guardian, which could explain a lot.

I'm not sure where I read it, but somewhere it's heavily hinted that the Prime Warframes came first and were Orokin build, while the normal Warframes are mass produced suits of armour (cheaper versions for "lower Guardians").