The Magic just got a lot better. Having Lewis at the 4 means the Magic can spread that offense out and get open looks from 3. Another added benefit of having him at the 4 is that he can drag his defender away from the basket, leaving Howard 1 on 1 in the paint. It's not a bad way to play, especially since you have the one of the best center's in Howard, and now with the addition of Carter, the best perimeter shooters in the league. With Lewis at the 4, if the opposing team decides to double on Howard, all the Magic have to do is move the ball and find the open look. More times than not, Nelson, Carter and Lewis will knock down open 3's. Having said that Howard really needs to work on his passing out of the low post. If he can develop that part of his game, it will only make his teammates better.
Even if they don't re-sign Hedo, they are better than last year. Carter is still one of the best Guard's in the league and he can give you that inside outside scoring threat. Carter also takes some of the offensive pressure off guys like Lewis and Howard.
Also, as long as you have Howard under the basket, you won't struggle to get stops defensively.