Some potential clarification on Family Sharing with Xbox One

[Soleron]

Torillian said:

Soleron said:
...

I find that a bit hard to believe, I think concurrently was just repeated a lot because it was important to note and not because it was necessary for playing the game that you both play at the same time.  

I'm pretty confident from this wording that it is necessary to both be playing. We will see.