okay first, Naruto had enough chakra to heal, its jsut Kabuto cut off his chackr when he hit him in th chest.

Second, again seeing as just having a large amount of chakra and jutsu at your disposal does not make someone "strong" it the abuility to use jutsu effectively against another apponent;- this include but is not limited to exploiting their weaknesses.

Tsunade phobia of blood was a weakness and only an imbacile would not use that to their advantage. for instance lets take Sakura, she is smart as can been but lacks any real pratical combat skill minus maybe genjutsu, that being the case yo wold not try and defeat her using Gen jutsu you would exploit use her weakness in taijutsu and f00king knock her butt out.- the fact kabuto was able to effectively exploit his apponents weakness is nothing but a testimony to his strength.

and for thoose you think Kabuto could defeat any one of the 3.. well frankly im somewhat a kabuto fan but he would not stand a prayer... which was clear after Tsunade regained her composure.

Considering it sems Orochimaru, and Jiraiya have combat abuilities that surpass the 5th's i dont think it likely he could defeat one of them. This includes conditions of Orochimaru not having use of his arms, or Jiraiya poisoned.