Chandler is an interesting option at the 3, but I'm not really sold on him.
Jeff Green, to me, is an immediate pass at this point. He's just another guy right now who's not really sure what he is (3 or 4?).
I think this year, you give Johnson a look at the 3, see if he comes into camp in shape, with a better jumper and play him. If he doesn't pan out, you hopefully suck enough to get a high pick and draft a SF (yeah, same gamble).
OR you hope that DeRozan elevates his game so much at the 2 that you don't need an offensive weapon at the 3 (and hopefully Davis at the 4 improves his offensive game as well) that you get more of a veteran presence at that point (e.g. Matt Barnes when he was with Orlando etc.).