Also, in X-Men Blue #20(or somewhere around there), Jeen was only able to hold off Xavier Jr. for a little while and had to run and get Prof. X before Junior overcame her. Meanwhile, Emma came along in that same issue and bested Xavier Junior in psi-battle, something that was beyond Jean's power to do. Again, Emma>>>Jean.
Here, we see Jeen can only hold out Xavier Jr for a little while: http://2.bp.blogspot.com/B3yIN3gbtPG...kAP_UyaQ=s1600
Xavier Jr. says he can't punch through Jean's shields AND worry about Magneto at the same time, but in other words, he can PUNCH through them if he is fully concentrated on her:
http://2.bp.blogspot.com/zGNqCccofaZ...8keqz94w=s1600
This agrees with what Jean saying she could only hold him out for a short time.
Then, we get Emma in the same issue beating Xavier Junior in a one-on-one psi fight:
http://2.bp.blogspot.com/CYBFe1tDi5f...nFn4c8lA=s1600
http://2.bp.blogspot.com/iGnfL-t1GIo...BbYHfK5w=s1600