The problem is that Friedl and Fraley are the same player. If they want to be efficient, they shouldn’t keep both. But if they want the best players, they should keep both.
In terms of platooning, only Fraley needs it. Friedl actually has hit better against lefties in his limited career so far. We don’t know about Benson. Not all lefties have to be platooned.
I agree with Kc61 that the Reds will keep Pinder because he can play in the infield. He actually hits LHP decently, .778 OPS. Platooning him with Fraley could work. Benson is in center for most games and Friedl is the 4th OF. Not the best arrangement , but it could be worse.