Don't like him much? I'm still grumbling over that Mongul encounter. Would've been interesting to see what damage the Mongul Corps would've done.
Sinestro is an anti-hero now, no longer a chief threat to the Oans.
He's always been more anti-hero than villain, which is why he wasn't always convincing as a bad guy, a bit like BA.
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Iboga chose not to fight, to allow himself to evolve. He had the wisdom to abandon the actions of war when he knew they would no longer serve him.