Idk yall but the lightning trails are exactly the same of CoC coating. There is an empty blank space around them, and there are flaws in the trails (like tiny holes and gaps)
And after the attack lands, we can still see them
I honestly see no difference from this, other than the quality of the image, which certainly affects the details (unofficial panels vs official VIZ)
Also, why did Luffy and Zoro felt so shocked here? They don't have an idea of who the old man is, so what explains such reaction? Perhaps they felt some unsettling aura?
Going a bit further into what Gaban showed this chapter... Did he saw the future here? This would explain he didn't care about dodging, he might've know that once he surrendered, Luffy and Zoro wouldn't try to land their moves on him.