Can OP bent space itself? Well, Gai did it
1) The way the distortion of space happaned in Gai's case doesn't fit the way the theory of relativity says space should bend due to sheer speed, at least not the way it was portrayed in the manga, and as such it cannot be a credible indacative of it.
2) even if point 1 wasn't true, distortion of space isn't an effect only applicable to relativistic/LS speed, but to any speed, and the effect would be noticeable to the traveler even at single to double digit mach's, which would mean a calculation would need to be done about it, but as the phenomena portrayed is radically different to the phenomana that the theory of relativity have formula's for, we can't do that either, so its certainly no indicator of any specific speed rate or value, if att all.
3) the effects of distortions of space are visible to the one traversing space and only to him, not any observer would notice a change in space at all, its relative change to the object in movement, not to the observer of the movment, as such the idea that Madara would notice the distortion in space 'created' by Gai's speed (as the former canonically did) not only kicks the entire idea out the window, but is ridicules, laughable and deserve any mockery it gets.
Lasers are not light speed, unless not in one Piece as they have mass
Henry Blazer is LS as well.And Niji is a slowass for Top-Tiers
雷を纏う剣で繰り出す光速の斬撃! 一撃で的確に敵を居る剣術と高い動体視力を持つ。
"An attack at the speed of light with a ray-covered sword! It has fencing and high dynamic vision to precisely hit your enemies with a single blow."
Forget speed,each Admiral is continentlevel and oneshots the Hokages