Light creates the gravity that bends the space. Is called science, study it.
ALL MATTER creates curvature in space-time. The thing is that it generally requires a lot of mass-energy in
one place for that curvature to be noticeable or significant. Gravitational lensing is used in astronomy
because of how massive celestial bodies are, from stars to black holes to galaxies.
Just applying E=MC^2 tells all one needs to know about why your specific argument can't work. The curvature caused by 9x10^16 Joules worth of light concentrated in a certain volume is the same as 1 kg of matter within the same volume; 1 ton = 9 x 10^19 Joules; 1000 Tons = 9 x 10^22 Joules, and so on.
Not to mention that any curvature of space-time caused by mass-energy in real life follows the Speed of Causality. If you were to suddenly remove the Sun from the centre of the Solar System, it'd still take 8 minutes for Earth to stop moving along its orbital path and start moving in a straight line. In other words, any curvature of space-time that "persists" even though the energy causing it has already been scattered to the wind i.e. there is no continual source of energy keeping the space warped, is purely for "rule of cool's" sake, thus unquantifiable.
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Then there is the fact that no Cero in Bleach has never behaved in any way like natural light. Cero and other spiritual energy-based attacks almost always physically clash with one another in the common Beam-O-War scenario, whereas natural light beams would just pass through each other unimpeded.
Ceros and other reiryoku-based attacks, like Getsuga Tenshou and Quincy reishi arrows, are consistently shown to have a tangible mass to them. They can be physically halted and stopped; they can be redirected by hand; they can be "shattered" and dissipated. The exact opposite of "intangible", as you've tried to claim before.