XSUPREMEXSKILLZ
The Immortal Emperor
Despite knowing the dangers of the dark side, Katarn utilized the dark powers of Force grip and Force lightning even as a Jedi Master. In spite of this, he was equally strong in light-side Force powers, such as Force absorb and Force protection, which he demonstrated during his mission with Jaden. This, combined with a number of Katarn's statements, indicates that he could have believed in the Potentium theory of the Force.
During the events led by Desann, Katarn showed a great mastery of the Force by relearning powers of both the light and dark side of the Force in a relatively short amount of time. However, it should be noted that Katarn revisited the Valley of the Jedi to quickly restore his connection to the Force, which increased his raw Force potential as a side-effect. It is, however, far more likely that because he had used them before, they naturally came back, as in the case of Darth Revan, an ancient Dark Lord of the Sith turned Jedi Knight. Katarn showed a strong will, resisting the many taunts and mind tricks Desann used on him in the Yavin temple.
During the events of the Disciples of Ragnos Crisis, Katarn had already become one of the strongest swordsmen in the New Jedi Order and successfully trained Jaden Korr, arguably the most famous hero during those events. An extraordinary swordsman, Katarn became the New Jedi Order's foremost Battlemaster. His general mastery of the Force was incredible and surpassed all but the strongest Jedi Masters. Even Darth Caedus acknowledged Katarn's abilities, something he rarely did.
-wookieepedia
just a few of kyle's abilities and what not
Also Caedus is said to be far stronger than darth vader, who is stronger than revan, meaning that if revan gave vitiate a tough time...
Edit: forgot if it was just stronger, or far stronger, but they do reference it somewhere that he was stronger than vader