If we go the bard route, should really memorialize the entire raid, not just Dorial. Among other things, I'd like the bravery of the White Wolves to be remembered, and the fact that we prevented the summoning is good PR for us.
The bards are ultimately meant to be PR for the Lightfangs to get our renown up. In that regard the duel is a single, very clear, event, that also shows that as elven swordmasters of Hoeth, our swordmasters can achieve clearly superhuman feats and are thus worth the hype.
Our other sword masters will surely have had their own feats, but killing in a lengthy battle say, a score of marauders, is still a lot more plausible for a human soldier to manage to do then to defeat a powerful Chaos champion in single combat due to the powerful blessings from the Chaos Gods that the champion will have.
Also! It is something that the entirety of the army brought by Razin saw happening. If someone casts doubt on Dorial's victory against the Jarl then it is very plausible that there will be someone available nearby who took part in the raid to tell the truth of what happened, whereas far fewer people will have seen what our other swordmasters did.
For example we took out the Jarl's second in command, but frankly I don't have much expectation that the Coinshields that were with us at the time will sing our praises of what we managed if someone asks them what happened there.
In a real sense Dorial's victory against the Jarl was simultaneously both the Lightfangs' most impressive as well as most visible accomplishment during the raid. As a duel of single combat it is also something that would be very difficult for someone to try to attribute to any of the other mercenary outfits.
I've been thinking about that actually. Once Dorial has enough strength to teach of course.
The thing is, his methods are designed for the Asur... he may teach a single slash for 10 years and once it is performed perfectly, he will move on to the next one. I don't know, if he shall have the patience to babysit human students, giving them a crash course in sword fighting, that he wouldn't even think of doing on his worst day.
Or he might be a genius teacher, having impeccable skills in how to transfer his own skills to others. Who can say? What we do know is that he knows more about how to swing a great sword then just about anybody in Erengard, and that alone will probably be enough to attract students if other people will come to view him as such.