[That is yielding more success. Going backwards, from her power's sudden growth to the unusually long period of her powers lying dormant and weak...

Then, much deeper in, in a part of the mind where even Jean barely remembers is her childhood - The first time she met Charles and Erik as a child (how unusually strong her powers were even then) to the first time her powers manifested as a child while her friend Annie lay dying. It's here that Charles will encounter the various mental blocks that's been placed in her mind. Many are gone now, releasing some of her power, but they are still clearly holding something in place.]