The biggest mistakes that rotisserie players make is picking up guys in a hot streak, but don't have the history to support it. If a player is usually a .650 hitter, then come October, he will likely be a .650 hitter, regardless of whether or not he had a good week in August. Younger players can develop, but their supporting metrics will still rise to the top. 6 HRs in July, with a 35/4 K/W, will still like yield weak results.