Add: Lefties don't play catcher, second, short or third after the preteen years. Don't even waste time thinking about it. A lot of kids were stars at previous levels. By high school the talent funnel starts getting real narrow. Earning playing time isn't about what players have done in the past. it's all about what they can do for the team riget now.
When my son was in high school there were three parents of kids complaining every year their kids were getting screwed by the coach. As a former college player and then travel coach I would nod my head and say, "uh huh." Then I would think to myself, "They're out of their mind. The right players are starting." Most coaches aren't stupid. Typically they can judge talent. They see a lot more than the parent sees. And they don't see it with bias. If it appears the coach has a favorite player it's typically one that works the hardest or is the most talented.