Sure, Harper will be a superstar, but recall that at about the same age A-Rod was benched and beat out by Luis Sojo in 1995 when the Mariners made a big run from behind to the ALCS.
I still think we are a better team with Harper playing than on the bench. I'm just getting uncomfortable with him hitting 2d when he is in a slump. I'd prefer him back around 6th or 7th in the order until he works things out, with spot duty for Moore against most lefties.
We need him and ALR hitting to avoid teams stacking RHP against us.