Found this in the New Essential Guide to Characters. It was obviously made before Dooku was retconned to be Jinn's master, but does it still apply since it *technically* doesn't contradict the former?
"Qui-Gon's master considered his apprentice the most skilled swordsmaster he had trained, though he was at times frustrated by Qui-Gon's tendency to go off on side quests to help powerless creatures."
It also fits because I *think* that Dooku actually did dislike Qui-Gon's living force stuff (can't remember the source), and overall there's nothing here that actually contradicts Dooku being retconned as Jinn's master.
So, is it a valid source?