From experience, Summer league management is made from folks like HokieOne. They spend nearly 40 weeks each year so that our sons have an opportunity for 8 weeks each year. Having a successful Summer team for those who run the team is a time intensive effort that few of us or our sons ever realize. Luckily, we got to spend a considerable amount of time with the management of 2 different Summer teams where our son played and learned first hand how much they do before our sons arrive in their town and after they leave.
With that background, playing time very often is not about what some other teammate is or is not doing. It is what our son is doing. Is he early, is he doing early work, is he staying late, is he doing everything off the field and within the Community that they hope he will do. Is he keeping himself ready for any opportunity which arises, and how does he perform when that happens.
One Summer, ours (a former D3 kid) got moved aside when a drop down from the Cape was signed. He happened to be a starting SEC shortstop. However, ours was not moved off the line up card. He then played every game the rest of the Summer at 2B, 3B and any game at shortstop the head coach felt the SEC guy needed "to rest."
Whether it is college baseball, Summer league baseball, or any level of Milb and MLB above, sometimes things are not fair in terms of playing time. However, if a player does everything off the field to be fully ready and then performs on the field when the opportunity arises, they play.
It is not what the other guy is doing or not.
A player gets playing time by doing the things he can control and doing them better and more often than anyone else and then performing when his opportunity on the field arises. Success occurs when 1000 hours of preparation meets one moment of opportunity!