You're really unwillingly to accept that Chief's personality is that of a Hunters. Alright, let's see what he's done in recent Halo games. Halo 2; Go assassinate the prophet of regret. Halo 3; infiltrate flood ship and retrieve Cortana. Halo 4; sneak into the Didact's ship and kill him, and destroy Composer. Pretty sure that's what a Hunter does, but wait, there's more. Halo 4; track down the last remaining marines in the forest. Halo CE break into the covenant ship and rescue the captain while the covenant and flood are busy with each other. Halo CE; Infiltrate the silent cartographer and collect as much as data as you can. I could continue, but I hope you get the point. The reason I'd be willing to say he is 50% both Hunter and Titan is because what he does is what a Hunter does, infiltrate, scout new regions, assassinate, etc. but depending on how the player goes through it can make the difference, but if we are going solely by the books than that means the Chief uses far more stealth and cunning then he does strength and punching.