Let's say Arraez has a week (6 games) like this: Starts for Polanco at 2B Starts at 2B, allowing Polanco to start for Simmons at SS Starts for Donaldson at 3B Starts for Kirilloff in LF Starts for Cruz at DH That's five starts in 6 games, which you'll notice is the same as the starts for Polanco, Simmons, Donaldson, Kirilloff, and Cruz. So Arraez replaces a righty 3 days a week, and everyone gets about 135 games, about 500 PA, and lots of rest. It's a great plan to rest our infielders, all of whom have bad wheels one way or another. Is that realistic every week? Maybe not if everyone stays healthy. But if any of the 6 miss two weeks, there's 10 extra starts for someone else. I agree, I don't know how you get Arraez the same at bats as everyone else unless he spends some time at LF or 1B. (Note my guess is they have a similar plan for Rooker, but will only try to get him in the lineup half time)