Board Thread:Naruto Discussions/@comment-30168130-20161011015658/@comment-27973430-20161031193140

Orochimaru can't use Sage Mode for one. Kabuto had Sage Transformation as well as Sage Mode hence his physical features when in Sage Mode so your logic can't apply to him. Minato's Sage Mode was better than Jiraiya's but he was way less experienced in its use so I guess you can say Minato is a better Sage than Jiraiya but Jiraiya is a better senjutsu user.