Kun's I, Jedi accolade/feat, Kun > Luke confirmed.
Kyo Durron attacks Corran Horn, Horn protects himself from the attack, Kun appears and channels his own telekinesis through Kyp, Horn states that Kyp's previous attacks were like 'light breezes' compared to Kun's 'full-on gale':
The Force blow he aimed at me glanced off my chest, yet it was strong enough to bounce me off the corrider wall. I managed to catch myself against the rough stone, but not before I'd slid half-way down the wall.
"You are not my master!" Kyp pointed back toward the dining room, "He is not my master! What good is it being a Jedi if we do not act?"
"What good is it being Jedi if we don't act responsibly?" I hauled myself upright, "Remember Kyp, the 'no good Jedi' kicked Kun's butt.." Kyp struck at me again through the Force but I expected it this time, I absorbed enough of it to let me create a shield.
"You're involved with someone who lost a long time ago, don't compound his error."
"And who will stop me?" I hesitated because Kyp's words seemed to echo within themselves, we were not alone, which meant Kyp's mentor had come to aid his apprentice.
"I will, if you make it necessary." An ancient sneer of contempt twisted Kyp's features.
"Puny Jedi, you are of no concern to me." Even though I had braced myself for another attack, it did no good. Kyp's previous blows were like light breezes compared to this full-on gale. I slammed back into the wall with teeth rattling-impact.
- Star Wars: I, Jedi Audiobook
Kun masked the attack on Corran Horn from a dining hall full of Jedi, including Master Luke Skywalker, from just fifteen meters away. Due to this Horn states that Exar Kun was more powerful than he believed could exist, evidently moreso than Kyp Durron or Luke himself, or anybody else Horn had met:
"What happened to you?"
"Kyp didn't like the menu." I winced as a twing rang through my ribs. "We had a discussion in the hallway, you didn't feel anything?" Heads all around the hallway shook, and I felt a cold dread begin to congeal in my stomach. If Exar Kun could mask the attack on me in such a way that Master Skywalker could not feel it barely fifteen meters away, then we were up against something more powerful than I'd cared to imagine existing.
- Star Wars: I, Jedi Audiobook