Actually, everything has been said in print... it's a battle of giants and it's something that Walt would say is none of your business - go right on and create the best you can. ↗
At one level you're condemned to the voice you have. But within those confines, you have a certain amount of freedom to range among your possible voices. ↗
My guess is that if they now choose to change of director for every other film, it's just because you can't really change the formula, you can merely try to film it your way. ↗