Recall that the Yamcha classifiers are trained on TR1; in addition, Rip is trained on the output of these Yamcha clas-  The difference in performance between TE1 and TE2 shows the difference between the ATB1 and ATB2 (different source of news, and also small differences in annotation).
the results for Rip show that retraining the Rip classifier on a new corpus can improve the results, without the need for retraining all ten Yamcha classifiers (which takes considerable time).