Some things aren’t like that. GR comes to mind. (Hilbert was working on it also, but only because he started as a collaborator of Einstein.)
I think his most unique work may have been the contributions to optics but stacked up against a fundamental description of what gravity and time are that completely changed our thinking on it… Not to mention that still to this day 100 years later we’re building machines to verify some of Einstein’s predictions. Oh and he invented the idea of lasers despite not believing in quantum mechanics.
Not to mention that Newton’s foundational contributions to math and science stopped around 28 when he started focusing on alchemy and other things. By comparison Einstein kept making contributions to physics throughout his life and his contributions “stopped” when he focus on the grand unifying theory trying to bridge quantum mechanics and relativity, a problem still unsolved 70 years after his death despite an accelerating understanding and technology in the world of physics.
> This idea was pointed out by mathematician Marcel Grossmann and published by Grossmann and Einstein in 1913.[7]
János Bolyai, not Bolshai. And certainly in the 1820s-1830s he investigated the Euclidean parallel postulate, arriving at a hyperbolic geometry in which it does not hold true (i.e., initially close parallel lines diverge), and eventually studying geometries which take no position on the parallel postulate. Lobachevsky also independently arrived at a hyperbolic geometry, and continued develop a substitute postulate for the parallel postulate.
However, all of the above is several long steps before developing differential geometry with its inner products encoding angles and distances on the tangent spaces at each point on an arbitrarily curved smooth manifold of higher dimensions, and an even longer one from the pseudo-Riemannian manifold of 3+1d General Relativity. Although many hands contributed to the positive inner product -> non-degenerate inner product, the reason anyone was doing that was because of Einstein's work on gravitation (in turn provoked in part by Poincaré's 1905 argument about Lorentz-invariance of the wave equation for gravitation, in the spirit of Special Relativity).