How Could Sweetrobin Arryn WIN the Iron Throne | Game of Thrones

We go through how Sweetrobin Arryn could have navigated events of Game of Thrones to eventually WIN and sit the Iron Throne. Does the Littlefinger still kill Lysa Arryn? What does Sansa Stark do with Littlefinger? Can Sweetrobin make an alliance with Stannis Baratheon or Tyrells? How long does Littlefinger stay alive? How does this effect the Lannisters in Kings Landing?