No I get what you're saying now.
Honestly though, Nomura LOVES to throw us off. Why did he never show Vanitas's face? To make fans think he was Xehy.
So WHY is he making small references to Xehanort being the same as Xemnas (that secret report, the ending sequence of BBS FM). To make us THINK that's the case.
But it's not. One of the newest things I'm hearing is "Terra is not Xemnas".
That's right. Xemnas is what Terra BECOMES. I don't care what they say... if you keep your best friend/potential gf's armor around for years and go out of your way just to spend time with it, there's no way the guy has egotistic intentions.
He was even obsessed with finding Ven, despite the fact that he seemed CONFIDENT that he would get KH no matter what, implying he probably wasn't desperate for a third Keyblade wielder (see his last report for this).
Ultimately, could you blame Terra for changing? He was constantly the pawn of Disney villains throughout BBS. And he saw for himself that the worlds were in trouble long before the Heartless and Nobodies plagued it.
So what does he do with Xehanort's knowledge? He plans to fix it. Not for himself.... but for Aqua and Ven. He used Xehanort's ruthlessness and knowledge as well as wisdom from Eraqus to become one of the most incredible antagonists in the series.