Naruto has some seriously big brass balls, I mean he just walks up and pets the Kyuubi, And when Kyuubi reveals that she's the Kyuubi, He just goes right back to petting her. Though the Mokuton variant that lets him converse with plant life, Would be great for information gathering from places like the Yamanaka flower shop And even the forest itself would be able to warn Naruto of any threat nearby and/or approaching. If the Tiger contract only has Senju clan members signed on the contract, Then wouldn't that technically make the Tiger contract a Senju family contract?