Star Wars: Clone Wars Season 7 Review - 4 Ups & 3 Downs From Unfinished Business
1. Echo's Ending
When Clone Wars brought back Echo, they also asked us why. His story seemingly ended in season 3 with his death in the Citadel, so, if he is coming back, he has to have a more fitting end.
Most people's assumption, including the Bad Batch, would be that he would be some sort of sleeper agent for the Separatists, still mind controlled and ready to betray the Republic at the drop of a dime. Thankfully, this was not the case.
As Mace Windu offers Rex, Echo, and the Bad Batch their well earned medals, Hunter refuses on behalf of their team. When Echo asks if he's sure, Hunter says that medals aren't really their thing, and asks Echo if they're his thing. Echo thinks about it, and discovers that he, a now disfigured clone, would be a good fit for the Bad Batch.
As Rex goes to claim his medal, Echo and his new team salute him goodbye, and Rex is happy for his friend, who is finally at peace.