Obito sees through Kakashi but not the other way around???

[Forbidden Twilight]

http://www.narutobase.net/manga/Naruto/243/17

right here obito says he will see the future through Kakashi.

http://www.narutobase.net/manga/Naruto/604/16

right here, he is demonstrating that ability.

this brings up some interesting questions:

1. how is this even possible?
2. why cant kakashi do the same thing? is it because he isn't a uchiha?
3. do the images happen at the exact same moment as kakashi sees them or later?