If jiraiya would learn a gennin with good chakra control like for example sakura, she may learn it better than naruto but due to her lack of chakra it would still be very hard and maybe even harder for her than for naruto.
thx to naruto's stamina, chakra and willpower he will be able to learn it. So I think naruto is the best candidate for this jutsu. and it suits him to.

that is what i think.