When did I ever say he's no1 duelist, also Yoru is inherently more of an initiator rather than the typical duelist. Aspas is widely considered the goat (and his most recent performance still provides evidence for that) yet he can't play yoru at all, does that make him not a contender for no1 duelist?
As an example, Chovy is considered probably the best player in the world (at least in the lane) in League - does that mean he can play literally every character to the same standard? Well the answer is no
Also you say he can't play neon/jett every map, but thats basically how T1 valorant won a masters by literally refusing to adapt to the meta and just shifting the team around what was most comfortable for the players and brought out their strengths. Also kk can play jett, raze, neon, waylay, chamber all very well - just needs the coach to actually cook up strats around it