The Houston Astros could use any positive injury news they can get. The pitching staff is sorely missing their ace, Hunter Brown, as he nurses a Grade 2 right shoulder strain. Other arms, including Cristian Javier, Josh Hader , and Cody Bolton, are all on the injured list. Overall, it's been an ugly start for the Astros' pitching staff. They currently have the league's worst team ERA at 6.04 and have surrendered the most walks and second-most home runs. Starting pitcher Tatsuya Imai was placed on the injured list on April 13th with right arm fatigue, but it appears he may be inching closer to a return. Imai is Making Progress on a Near Return Houston Astros starting pitcher Tatsuya Imai departs the mound. | Joe Nicholson-Imagn Images Per Chandler Rome of The Athletic (subscription required), manager Joe Espada said that Imai will make a minor-league rehab start on Tuesday with Double-A Corpus Christi. He threw a bullpen on Sunday, but this rehab start will be his first game action since suffering the injury.…