who do you think the best chess player to never become world chess champion is?
Ivanchuk and Keres
Viktor Kortschnoj
Hübner, Rubinstein, Keres, Bronstein, Stein, Sulthan Khan in another life, Morphy, Schlechter.
If it is possible for someone to answer me
Wei Yi for sure
Paul Morphy by Far
If we are talking "relative to their competition" then it's definitely without a doubt Paul Morphy as there was no official champion then.
Rudolf Charousek, Mir Sultan Khan, Rashid Nezhmetdinov
to name some hidden talents who never had the chance to unfold their true potential.
Ben Finegold