Sandra Oh hasn’t appeared on Grey’s Anatomy in over a decade, so why is there speculation she could reprise the role of Cristina Yang in season 23? ABC caused fans to question a potential return when the official account for the network shared a photo of Oh, 55, on Wednesday, August 12, writing, “Heavy on the Yang.” Social media users took to the comments section to share their theories on what the cryptic post meant. Many suggested that resurfacing a photo with Oh meant she was filming scenes in the upcoming season. Others were quick to point out that with Meredith (Ellen...