I already addressed that argument
Here.
Again, best case scenario he moved his hand a few inches
Also Iroh didn't have to move an inch from his position, so either he got extremely lucky and happened to be exactly where the lightning was going to strike
Or the more likely scenario that Iron was able to act as a lightning rod and draw it in
Seriously between the time Iroh moved his hand when the lightning was off screen, and the time the lightning came back on screen, how far do you think Iron moved his hand? Maybe 6 inches? Maybe a foot?
Lets say he moved it a foot (which is being generous) even if we use the gross over-estimate of the speed of lightning this site uses of mach 1300 (again major over-estimation but I'll humor it) Iroh moving his hand 1 foot before mach 1300 lightning lets say 50 feet rough estimate, would at best be in the high hypersonic range
then Zuko should have been able to lure lightning to him at the end of
No he wouldn't lmao what on Earth makes you think Zuko would be able to draw the lightning in because Iroh did when Iroh at this point was arguably the best fire bender on Earth and Zuko was an absolute chump in comparison?
Iroh taught Zuko the motions on how to re-direct lightning, what makes you think Zuko is going to use a technique he's never used in practice before to draw lightning toward him?
Also lets keep in mind that when Iroh re-directed lightning, they were on a large metal boat which would made it easier for the lightning to get close enough for Iroh to draw it in and re-direct it, vs Zuko who was on a cliff screaming and yelling at lightning to come to him