I don't think it's fair to judge Nana on his 3 point percentage so far this year. I think he still can be the knock down shooter we all hope, but maybe not this year. The minutes are generally after he has been sitting on the bench for the first 38 minutes of the game, he is coming in cold, and isn't playing with guys who are going to be setting him up for open looks. Also it looks like he is forcing his shots, because he wants to give himself a real chance in the 60 seconds at a time he has.
A little bit of the same can be said for Jack as well,'. Jack at least gets a few more "real" minutes than Nana, but it's still hard to come in cold when everyone else is already in the flow of the game.