Having tried to redo the lightsabers on ANH myself before, I'd like to point out that the original rotoscoping was absolutely awful - sometimes the blade would be so far away from the hilt it was almost 40% hanging over. Oh, and at wrong angles. When I did it the only way to have a consistent blade was to have it slightly fatter than the ones 'standardised' by the prequel trilogy.

I dont know if this was a problem Ady had though.

Another point though is that the 'original' blades were actually really fat. Think back to Empire, and the closing fight of Jedi - the blades there are humongous!