By Daniel Chavkin The Atlanta outfielder is officially back from his torn ACL rehab. View the original article to see embedded media. Ronald Acuña Jr. is back. The Braves announced Thursday they reinstated Acuña from the injured list and designated outfielder Alex Dickerson for assignment. MLB.com’s Mark Bowman reports Acuña is expected to be in the lineup for Thursday’s game against the Cubs. Acuña was originally expected to continue his rehab assignment through the weekend. Acuña’s return is nine-months removed from tearing his ACL last July vs. Miami. He missed all of the Braves’s World Ser…