For the people commenting on Sargera's size. He is a Titan, and ridiculously powerful, one could assume that he may have some level of shapeshifting in the sense of altering his size. More or less like Archimonde, as explained during the war of the ancients and other sources that he could alter his size at wil.
Even in Chronicles the titans meet on some planet when Sargeras kills them all, they would have to be smaller than the place to be at the place... or they would just be space wandering colossus 100% of the time.