The Braves are not dumb. My guess on how the negotiations went with his agent? 'Hey, we like Ian but we have other guys ahead of him. However, we're willing to take him so we can save some money. He's likely not going to go before pick __ if we don't take him, so we'll give you __ more than that if you'll agree to take it at 3.'
You can either agree to that deal or take the gamble on where you're taken after 3. I don't know why you guys think Anderson or his agent are privy to the Braves' thinking and can then use that info against them in negotiations. The Braves aren't going to show their hand.