Played cool with you! Add to friends, I will be pleased. <3

why does she wear the beard

Margilus didn't created Warframes, she wanted to help these children to live better. And he is the one who created Warframe Primes. Not regulars. Not unless you can look up on Ballas and see how he made them. I'm sure he gave alot of his description about warframes and enemies.

Yeah, I played through that mission yesterday. They sentenced her to death for betraying them.
I'm pretty sure her husband wasn't the one who created Warframes though.

Sounds like my lore theory is completly crap. I mean it's like as if the quest were like books. By the way did you know that Margilus is against to kill these Tenno? Her husband had no choice left, but to kill her and later created Warframes.

Well, yeah, Sentients fall under "or they were CREATED by humans (or these races that came from humans) at some point" of course.
The Sentients didn't create themselves. They were just drones that ended up gaining Sentience.

What about Sentients? I'm not sure if they already did found humanity before the humans revolt against Sentients. I meant they never did created sentients in first place until they contacted with an energy based 'something' called, "Oro' or something else.

Well, from what I understand, pretty much all of the enemies originated from humanity in some way.
Either their ancestors were human at some point, or they were CREATED by humans (or these races that came from humans) at some point.

I'm pretty sure the humans are Orokins. We don't know if the humans did made their relationship with Orokins before they proceed into Goldan Age.

You only unlock your Operator like halfway through the game though (halfway through the story missions at least)... And you only unlock the ability to customize them at first.
To actually use them in battle, you have to complete one more quest.