1. All cats are ninjas. True fact. It's the ones who aren't who's strange. Expect him to sneak up on you randomly and pounce, when he's older.

2. Give him 'til the weekend and spend a full day at home, let him get used to your noise and you scents. This takes time. The first time we moved, Ali stayed behind my computer for three days before she went exploring, and she was a grown cat who knew all of us already. Don't push things.