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There is no way to keep your Ballplayer’s swing from reseting to default in Diamond Dynasty. As the video shows, it will always reset whenever you exit your lineup menu.
The swing type is one of the only gameplay effecting aspects of editing your created player so hopefully it can be fixed.
If you use your Ballplayer CAP in Diamond Dynasty their secondary position will not function properly in game despite saying “Secondary Pos” in the lineup screen.
Your catcher will let balls bounce off his chest
Your shortstop will not turn double plays
Only the primary position functions properly in game.