Specter is also a giant man-ape who's been defeated several times by a kid with a taser sword and has no sense of cooperation from how you've shown him off.
And yeah, Azula could manipulate Z, but his mental fortitude wouldn't logically allow that. He doesn't bend his morals for even Risky Boots, who he... has a crush on. They're occasionally a thing. An evil thing.
Zeliyis is more of a threat than Z, yes. But Z is an immediate and unifying threat that gives us our United Army for when Zeliyis decides to get off his ass and start doing something. Think of Z as the Loki to the United Army's Avengers. Though Z's much harder to take down than Loki and is more similar to Ultron... eh it's not perfect but the analogy works.
And yeah, Azula could manipulate Z, but his mental fortitude wouldn't logically allow that. He doesn't bend his morals for even Risky Boots, who he... has a crush on. They're occasionally a thing. An evil thing.
Zeliyis is more of a threat than Z, yes. But Z is an immediate and unifying threat that gives us our United Army for when Zeliyis decides to get off his ass and start doing something. Think of Z as the Loki to the United Army's Avengers. Though Z's much harder to take down than Loki and is more similar to Ultron... eh it's not perfect but the analogy works.