At the end, Reina was the Torn protecting the Rose (Daisy).
Willing to sacrifice herself for Daisy to get the truth and her purpose.

Points not noted by the OP and nearly all commenters:

Agent If You Cut An Arm Two Will Take Its Place

The Kree never touched a diviner.
he recovered a crate of them (six) but was empty

If she didn't crumble and we didn't see her body, we are not sure.

He is a friend of Pepper, so Stark will not ask to be paid for the hand he gives.

pain, a dog bite him and the pain will get memories back.

Gordon told it was a mortal threat to them, in the wrong hands.
But not in their hands.
So, it is something able to empower other people someway.

Anakin lost his legs and was pretty burned out by lava heat.
He barely survived and needed the hate of the Dark Side to keep going. in the Empire Strike Back we see his brain.

geekier

Pearls, pearls!!!

Big, drooly, teleporting, smart dog.

Inhuman develop a cocoon around themselves, Humans become stone

Just a bit.

The shot remind me of the way Anya died at the end of Buffy series.

She would not have killed Coulson because she would know Daisy would immediately know Jiajing was bullshitting her.

The fact Jiaying is telling us they have no way to purify the terrigen crystals so they are mortal to normal humans, make pretty easy to foresee they will find a way in the future.
When the war go from bad to worse for Jayjing and the Inhumans, or for some other faction, they will try to build a terrigen bomb able to…

He never touched it, he is insane but human.
He brought it to Whitehall inside a case. And he told him the real name and "I will tell you how to use it, but not how survive it".
He made Reina touch it at the start of the season after they recovered it from Creel.

Was interesting, in the pilot of the serie, Maria Hill telling she drow a porcupine about Ward's human relations.
Then we have Lance Hunter drawing a porcupine on Reina photo, and Reina is a Porcupine.

Is FF related.