ZiPS is a projection model, but one that includes minor league players, players moving onto , and often times, recently retired players. Carson Cistulli offers this disclaimer:
Disclaimer: ZiPS projections are computer-based projections of performance. Performances have not been allocated to predicted playing time in the majors — many of the players listed above are unlikely to play in the majors at all in 2017. ZiPS is projecting equivalent production — a .240 ZiPS projection may end up being .280 in AAA or .300 in AA, for example.
The most intriguing group to look at is the starting pitching group, so a good starting point would be to take a look there.