If they were to do this, my vote would be Arraez, Polanco, Kepler, Sano, Rosario.
That said, I don't really have an issue with how the lineup is currently constructed. It's working, but I wouldn't quibble if Rocco decided to do something along either of these lines either.
Where does Cruz fit in?
And Eddie Rosario's batting .287 with 27 HRs and 85 RBI (on pace for about 34 HR and 110 RBI). You want to move him down in the order? On a team that's been playing at a .611 winning clip?
I also love the idea of Arraez leading off....but how much better can this team play? I can see if this team starts another major skid, but if we're winning 5-of-6 games I say just leave things be.
Good problem to have and a fun discussion to have, with all of these numbers to look at!