The changes to the technique do have something to do with the chapter after all...
Ninjutsu has different requirements depending on... well, the technique. Dojutsu-spurred ones have a certain dependency on the eye, so if the eye were paralyzed or unable to perform its function, then the dojutsu-reliant ninjutsu would be unable to be used.
Raiton no Yoroi can only be set on the foot by the same 'reflex' motion that causes ordinary, real people to react to stuff, except they don't get surrounded in electricity and start dashing around at incredible speeds.
Mastery of the technique sets the tone; Minato can use Rasengan with one hand, Naruto needs(ed) a clone to shape it to make up for his lack of chakra control early in the series. Minato can perform hiraishin with relatively simple movements, while the bodyguards had to form a formation in order to use it.
The chapter itself is linked to this post in the fact that the chapter itself has brought upon the discussion.