Titans are the strongest class in terms of physical strength. Can hunters and warlocks bench press cars? Can they punch someone with the force of getting hit by a wrecking ball? Can they break a reinforced concrete wall with a punch? No they can't. Only Titans can do those things. Sure warlocks can throw a supernova from their hands and hunters can fire a bolt of pure sunlight. But their physical strength is nowhere on par with a Titan's. Go ahead prove me wrong, make a logical argument on how hunters and warlocks can bench press cars. Lemme give you a hint, they can't!
Edit: this is me right now http://i1.kym-cdn.com/photos/images/facebook/000/732/170/796.jpg
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I guess titans just determine if they want to be underpowered or the master race each day by flipping a coin