That's why Rubel doesn't want the rest of the Org to find out about HAs (Half Awakens).
HAs are the "holy grail" that the Org desires, the potential to Fully Awaken and De-Awaken at will, withOUT becoming an Awakened :D
Clare being only 1/4 Yoma must be helping her with this, hehe:D
However, Jean while at 2/4 Yoma, amazingly out-did/does even Clare. Able to maintain a Full-Bodied Awakening, while just barely and only temporarily not becoming an Awakened. However, Jean was putting all her effort into this, still a long ways off from being able to move and fight while with an Awakened body, while remaining a Claymore/HA and not an Awakened.