For each of the past four seasons the Cincinnati Reds have had at least ten different starting pitchers. Eight to ten is the MLB norm. 2015-2017 was not the norm.
2014 was fairly normal. Johnny Cueto, Mike Leake, and Alfredo Simon all made all of their starts. The number was high because the Reds couldn’t find a suitable replacement for the injured Mat Latos.
2015 saw a year of trades and inconsistency. Cueto and Leake made their starts until the Reds traded them. Homer Bailey, though, only made two starts thanks to injuries.
2016 was a disaster.