A few weeks ago I wrote about how Gregory Polanco is the key to the offense for the 2016 season. The main point of the article was that the Pirates were expected to see an offensive downgrade at first and second base with the departures of Pedro Alvarez and Neil Walker, and that improvement from Polanco (which was seen in the second half) would help to off-set that. Add in the improved defense in the infield, and the Pirates could be a better team if Polanco's second half improvements are for real.
The Pirates were already going with Josh Harrison at second base at the time of the article, but one thing that was missing was the first base position.