Xbox – How does Xbox One gamesharing work when more than two accounts are involved

Kinect only saves your facial recognition data in its numerical form and only locally. Since the data is not sent to the cloud you won't be able to just sign into your account on a friends console. Here's a snippet from the Kinect Privacy website:

Data Used for Sign-In. As an optional feature, Kinect can collect and use identity data to enable you to sign in to your gamer profile. This is mostly facial recognition data that identifies individual players. You can decide whether to use this feature, called Kinect ID, and control whether this data is collected. This data is stored permanently on your console to enable sign in to your gamer profile, and is not returned to Microsoft. This information is stored as a long series of numbers, and it does not personally identify you.

Copying your profile however could work since it will take the local data associated with your account but I don't have a Kinect to confirm it :( Sorry. For more information you could check out the link

Source: Kinect Privacy and Online Safety

Hope that helps :)

AFAIK all the DLC I downloaded on my gold account, my brother with a silver account has access to on the same xbox.

As far as copying to another console goes, that's typically not allowed to prevent people from downloading the DLC to their friend's xbox as well as their own. This page from the xboxlive site should help to answer any questions you have.