__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk
ROTJ Luke was making more after images with his blade than even Exar Kun.
__________________ "Vader's pulse and breathing were machine-regulated, so they could not quicken; but something in his chest became more electric around his meetings with the Emperor; he could not say how. A feeling of fullness, of power, of dark and demon mastery -- of secret lusts, unrestrained passion, wild submission -- all these things were in Vader's heart as he neared his Emperor. These things and more."
That's not an argument that's related to this fight. Bane would still show Luke his zaps even if he weren't close to a Sidious who was clearly barely trying.
Luke literally disarmed himself when Palpatine unleashed the bolts, and in the novelization Luke's Deflection was initially successful to some degree. He isn't giving up his lightsaber here and Bane isn't remotely as powerful as Palpatine.
Still not proof that Luke can block Bane's lightning. Luke "deflected" Sidious' weak lightning before he increased the power and that's contradicted by the movie where he clearly doesn't deflect anything. There's no indication Luke knew how to block lightning with his saber either or would be effective with it.
You don't block a Force Choke with a lightsaber, lmao.
Even Hetton and the Huntress dodged Bane's Lightning, so Luke can do so. And his strength canonically matches Vader's, so he can withstand the impact of the Lightning slamming into his blade.