I still think this debate is somewhat backwards - the Titans don't look Human, Humans look Titan given that they're the final link in a chain that progresses from Human to Vrykul to Titan-forged Vrykul to Keeper to Titan. I do agree there's a definite nod to Khaz'goroth's look in many Dwarves, but whether that's a product of their creation or just an affectation on the part of the Dwarves is unknown. Most speculation points at Khaz'goroth as the direct creator of the Earthen, the beings from whom the Dwarves are derived, so some of that similarity may be down to Khaz'goroth putting his likeness into his work to a degree.