Trea Turner had a .937 OPS in over 300 ABs last season along with a batch of steals. If he drops in the lineup, it is only to #2. You aren't dropping him to six.
I'm a big believer in not taking the bat out of your star's hands. I hate bunting and stealing right in front of your big bat. I don't think it applies here thanks to Daniel Murphy. Teams can't pitch around Harper with a big time hitter right behind him.
I think Zim trends down eventually, Rendon trends up, and Wieters/Werth end up as decent bats. If Turner comes back and gets going this lineup will put up ridiculous numbers.