One in a series of previews of the key decisions the Astros will make at spring training: Back end of starting rotation Candidates: Philip Humber (R), Erik Bedard (L), Alex White (R), John Ely (R), Brad Peacock (R), Dallas Keuchel (L). Breakdown: Houston’s 4-5 starters rival the outfield corners as the Astros’ biggest areas of uncertainty. The plus: Houston has options. The negative: The Astros have options. Humber threw a perfect game for the White Sox in 2012. He also posted a 6.44 ERA and was allowed to walk away from Chicago. Bedard won 28 combined games from 2006-07. He also hasn’t won more than seven since 2008, posted a [...]