The importance of the intelligence is the location of the 8 tails and 9 tails. That is key to Madara completing the task of putting all the tailed beasts together. Kisame was already stuck there with no way out before, so the espionage seems like a logical next step.
However, if the 9-tails already lost half of itself with the 4th Hokage, wouldn't that pose as a problem on how to fully integrate all the tailed beasts? Of course, that final coffin could be that of the 4th Hokage with the 9-Tails still trapped inside. However, that would then pose the previous problem that when the host dies, the tailed beast inside also dies. Then again, it would be a convenient plot device to use the 4th Hokage's 9-nine tails and allow Naruto to keep his 9-tails to help out his development as well.
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