HOUSTON — Their starting rotation does not throw strikes, their bullpen is unbalanced, and no outfield in baseball boasts a lower batting average or on-base percentage. According to FanGraphs, they awoke Monday morning with 13.7 percent odds to reach the postseason, high in the eyes of anyone who watched these Houston Astros play for the previous three days.Raising those chances requires reinforcements their fallow farm system and self-imposed financial limitations might not allow them to acquire responsibly. The crossroads they’ve circumvented for two years still sits in front of them. Convention might suggest confronting it with some sort of sell-off, especially if these flaws follow them across the next 14 days.But the Astros also have Yordan Alvarez, a slugger authoring a season unlike any in their 65-year existence. Alvarez hit two more home runs in Houston’s 8-5 win over the Miami Marlins on Monday night, moving him into a tie with Kyle Schwarber for the major-league lead while maintaining his place atop all three American League Triple Crown leaderboards.“The thing is, everyone is marveling at the season he’s having, but we’re witnessing it day in and day out,” shortstop Jeremy Peña said. “To us, it’s firsthand that we’re seeing it. We feel that every time he steps up to the plate, he’s going to do some damage.”