Fantasy baseball managers loved Chicago Cubs outfielder Pete Crow-Armstrong last season because he reached the exciting marks of 31 home runs and 35 stolen bases -- one of only seven players to achieve 30/30 excellence. Then again, all those other players also drew at least 30 walks and, in most cases, at least twice that many. Crow-Armstrong, also an NL Gold Glove winner, did not. This aggressive nature and severe lack of plate discipline, while not defining his breakout season, might define his future. Crow-Armstrong's 4.5% walk rate, the fifth-worst mark among 145 qualifiers for the batting title, surely played some role as pitchers adjusted and began to retire him with more regularity. Crow-Armstrong hit .265/.302/.544 during the season's first half, providing an outstanding 25 home runs and 27 stolen bases (in 31 attempts). He easily made the All-Star Game roster and was even considered to be an MVP candidate.…