"Luke Skywalker tested Kyp’s Jedi power potential. What he discovered was the strongest Force presence he had known since his Masters, Obi-Wan Kenobi and Yoda."
-- Essential Guide to Characters
Th quote specifically mentions Jedi power potential in the first sentence, that can be read to tie in with the Force presence Luke sensed, especially given it goes on to name strictly Jedi, despite the fact Luke thought DE Palpatine was the most powerful being to ever exist.
"Once my greatest student, then my greatest enemy under the tutelage of the shade of Exar Kun
"
-- Jedi Academy: Leviathan #1
Oh, so you mean Kyp Durron AND Exar Kun? It isn't much of a stretch to think nigh-full potential Durron - armed with knowledge from one of the most deadliest Sith Lords ever- in Exar Kun, could be a greater threat than Palpatine, all things considered. It wasn't Kyp by himself, as you'd have others to believe.
The rest isn't relevant to the Kyp point, nor do I care to comment.