Carlos Tevez has mystified people for quite some time now. That odd night in Germany, his self-imposed exile, calling the manager a "dog" while on his way back to the team. What is he after?
Achilles and the Greeks were out to destroy Troy. Agamemnon had to give up one of his concubines at Achilles' urging, so he decided to take one of Achilles' out of spite. Achilles flew into his famous rage and refused to fight. He sat in his tent and let the Trojans dominate the war. He refused to go back until the Trojans had killed his best friend, and probable lover, Patroclus.
Why did he sit on the sidelines and wait? Glory.
Achilles felt that taking his favorite concubine showed that Agamemnon didn't value him as a warrior, and didn't give him the glory that was his due. He only came back to avenge the death of his friend.
Tevez obviously has slightly different aims. However, he exiled himself and waited to see what would happen without him, just like Achilles. He gained nothing from sitting out and ended up losing a lot, just like Achilles. He's also seemingly been welcomed back when he calmed down by his fellow warriors (teammates), just like Achilles.
What is Tevez after? He's won almost everything there is to win at the club level. He obviously has the money to burn. What more can he want? Personal glory. Mancini hired a younger version of him, Kun Aguero, and sat Tevez on the sidelines. No chance to prove his worth, or court other suitors for his services.
Unfortunately for Tevez, this Achilles analogy doesn't have a very good ending. The Greeks lost terribly without Achilles, but the Citizens have done well enough. Worst of all, the Greeks were only triumphant after Achilles had died.