Note the Master copied the Key of Rassilon before, so I expect that's what the bracelet was.
Clara seems to rebound a little too quickly. But, that is TV for you, where tragedies are resolved in a blink. A person could be completely devastated and need months to recover from such a loss.
I do wonder why the Doctor responded the way he did after visiting Gallifrey. Because he can't go back? Or won't? Something about Gallifrey perhaps?
Here's where I'm confused: Missy's cyber-control bracelet. She gives it to the Doctor, he tosses it to Danny, Danny uses it to command the Cybermen to fly up with him into the clouds and self-destruct, destroying the clouds and their Cyber-pollen. Okay, so far so good. But in my mind, the cyber-control bracelet should then be destroyed at that point.
I do wonder why the Doctor responded the way he did after visiting Gallifrey. Because he can't go back? Or won't? Something about Gallifrey perhaps?
If you have a problem with the Nethersphere, it should be - "The boy Danny sends back - where did he get a physical body?"
If the key allows Missy to enter the Nethersphere, several times it appears, by transferring her physical being to data, and then her data back to physical, it seems possible it could transfer the boys data to a physical body.
Also it's a one time thing because the bracelet can only effect one wearer, and or the Nethersphere is running down on power.
Yeah it makes very little sense that bit, for example what is Missy doing in the Nethersphere talking to the AI construct and welcome some people, if it is just a datacore?
Why does she vapourise him in the same way she does everyone else if he is just a data construct and not a real person?