@Insight Convenient plot, that explanation is ridiculous. It is like saying i have this thing so I can win, does not need to explain. So this one thing can hold every single powerful entity? Come on even you should think this is way too convenient. Plus they should also realize their entire involvement may be the reason the world ends. Try holding onto sand, you only have an illusion of control.
If they instead stated they investigated and invested in each person's ability AFTER it was manifested, sure perhaps. But to know prematurely, even ones that were never discovered and classified then found a way to contain is ridiculous.