The Cincinnati Reds used sixteen different starting pitchers in 2017. They also had to keep Stuart Turner and Dilson Herrera on the forty man roster all season to protect them from leaving. That resulted in a tight forty man roster this off-season.
The impact is that the battles are well defined heading into spring training. Unlike recent seasons, the Reds aren’t desperate to find enough people to fill the roster. One or two non-roster invitees could make the team, but it that is unlikely.
On the pitching staff barring injury there is only the long reliever spot in the bullpen that could be open for someone off of the roster.