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Would be Eurylochus's line in mutiny, "If you want all the power you must carry all the blame!" Because even though he sings it to Odysseus, it's not about Odysseus at all. That line perfectly encapsulates Eurylochus's own arc, and foreshadows his death.
I'm sure other people have talked about this as well, but I had to comment on it and how clever it is. Because Eurylochus did want all the power. For a while now, I think. That isn't to say he's been power hungry, but throughout the course of the musical he has grown increasingly dissatisfied with Ody's decisions. Especially from Ocean saga onwards, when Polites isn't there to keep the peace, I get the vibe that he feels that if only he was the one in charge, he could get them home. He would never have gotten them into these dangerous situations they find themselves in. It's his coping mechanism - blaming Odysseus helps keep his own guilt about the wind bag at bay. It's probably why he feels he can tell Odysseus about the wind bag, because he feels that it isn't entirely his fault.
Odysseus doesn't agree, of course, and all of this pent up anger and frustration finally comes to a head in Mutiny. Eurylochus yells this line to him, fully believing that Odysseus doesn't deserve to be in charge anymore and he has a point but that's a post for another day. What Eurylochus doesn't realise, though, is that when he takes Odysseus's power from him and becomes the leader, he will be held to the same standard.
So when he chooses to kill those cows, his words become a self fulfilling prophecy. For a moment, he had all the power. He made a choice. And he had to carry all the blame.