These assessments usually revolve around major trophies won or directly influenced by a particular individual. Neymar had never really done that - prodigiously talented, but has never fully manifested it in terms of effect.
Contrast with the little Argentinian, who was a pretty awful human being, but carried Napoli to impossible success in Italy, and won a World Cup or two, pretty much single-handedly (no pun intended).
The talent level is one thing (e.g. Gascogne, Neymar, even Cruyff) but have they effected major outcomes?
I’d argue that Modric, for one, has done much more than Neymar.