George Lucas said that Anakin was more powerful but he probilly meant he was more powerful in force power, force power and lightsaber skills are two diffrent things. If a jedi is more powerful in terms of force power then that does not make them better swordfighters because swordfighting and force power are two diffrent things. Nick Gillard ranked Anakin a level 8 in the begening of the movie but he got to level 9 when he turned to the dark side Nick Gillard said that if a jedi gets to level 9 too fast then they will mess up. Palpatine maybe could win because Anakin does not think to clearly but I am not sure. Force powers affect your lightsaber skills. Yoda and the Emperor are both especially strong in the Force and are ranked at the highest lightsaber level. Yoda can hardly move without the Force, but is very fast when he taps into his powers. It makes sense that Anakin would be a better swordsman than Obi-Wan if he's "more powerful". That's why Anakin had Obi-Wan on the defensive for most of the fight. Anakin didn't perform any impressive Force feats on Obi-Wan, so I think his superior power comes primarily from lightsaber skills. All of Gillard's rankings are perfectly consistent with how the fights onscreen play out.