From what we understand Inoue was given some issues in the first 3 rounds that the men shared. The reach and general length of Tobe apparently forced Inoue to think about what he was doing. After the opening 3 rounds things turned around with Inoue finding ways around the jab of Tobe and finally showing what he was capable of.
Tobe is the third notable fighter that Inoue has sparred with in recent days and he's set to spar with another top class fighter tomorrow in the form of former world title challenger Takuya Kogawa (22-4, 13). This sort of sparring may not be something available to all fighters but it's clear that Inoue is using it to develop his exceptional talent and it's also likely to help the likes of Tobe and Kogawa bring out the best in themselves.
(Image courtesy of Naoya Inoue's Ameblo blog)