Gosh, yer right about that. Roxas and Xion are... well, they're special cases, so they're gonna need some time to train themselves before their power can stand on their own. They're sorta part of Sora, yanno- they have to learn how to make their power their own first, I think. And Kairi... well, she can use a Keyblade, but she's just startin' out in how to use it. She's probably the one who needs the most trainin' before she can get out on the frontlines.