No offense, Lambon, but Terra is not the only "main" character. The beginning starts with her as she works as a good springboard to introduce most of the other major characters. The game DOES focus on her quite a bit, but the majority of that focus is concentrated until you get to the Rebel's Camp and the split the party up. Though you all get back together again, Terra, by that point, is not THE most major focus. Yes, the ending also fixates TO A POINT on her, but it does so with all the other characters as well.
Also, you say this is a fact. Give me the evidence YOU have from the company that this is a fact.