who is the all time greatest duelist?
On the one hand, true. Jinggg is an incredible Raze player - arguably best in the world. His Neon when briefly used was also good. However, you could argue Jinggg's major flaw is that he can only play Raze, Phoenix and Neon well. In my opinion, the best duelist should be able to play any duelist agent and fry hard on them. That way you have objectively good map flexibility.
In terms of "all-time", you could have put Aspas, but that Toronto all-time low has got to be the biggest fall-off. I think t3xture could be in the conversation since he has been popping off insanely on so many duelist agents. Derke has been a beast for a long while. Kangkang has insane peak performances. I would still have Jinggg in the conversation since his Raze is undeniably amazing to watch.
His Jett was alright. F0rsaken was the better Jett player so he would play the agent as opposed to Jinggg a lot of the times. Jinggg's Reyna pocket pick on Haven was iconic as well. I can't imagine him playing Yoru since something is already trained on the agent and Yoru is a very cerebral agent as you have to pay attention to your TP timings, placement and make sure that you are flashing effectively for the team. Jinggg is very much a tip of the spear player with his aggressive plays - Yoru could facilitate that but the agent is ideally used like an info-duelist especially in ult.