-- There is still one person who is sorely lacking the recognition she deserves. As Fiona Gallagher, the Chicago-native in charge of caring for her five younger siblings, Emmy Rossum has been delivering television’s single greatest performance. More dimensional and complicated than Macy’s Frank, Rossum’s nuanced, natural performance stands at the show’s core — the battered, beaten, tough-as-nails, resilient heart of “Shameless.” Whether the series is funny or sad or serious (in reality, it’s all of these things), Rossum handles her scenes with dedication and care, masterfully weaving between genres as well as, say, Rose Byrne, an actress as great in the dark, dramatic television series “Damages” as she is in the summer blockbuster “Neighbors.” But Rossum takes it even further than Byrne, with the pendulum of emotions swinging so quickly in “Shameless,” as if Byrne’s character in the Seth Rogen romp were meant to face off with “Damage” ’s Glenn Close at “Neighbor” ’s conclusion. In the season four episode, “There’s the Rub,” Fiona’s at-that-moment blissful exuberance comes crashing down when she discovers her toddler-brother unconscious, having inhaled the remainder of her celebratory cocaine. That shift in Fiona, exemplified with perfection by Rossum, should have ended the Emmy conversation right there. In an ideal world, Julianna Margulies’s second statue for “The Good Wife” would be on Rossum’s mantel. But this isn’t an ideal world, and Rossum’s performance went without even a nomination for the fourth year in a row.