I agree Favors is the future at PF, maybe even C, but at 19 I'm not that sure he's quite ready to be a starter.
Evans hasn't really spent time at SF that I'm aware of, not even in practice. I agree that's the direction we should go but he needs to spend the summer with a coach learning the nuances of SF, s well as just getting stronger.
Next year's starting lineup of Harris, Hayward, Evans, Favors, and Jefferson works for me...