1- Yes. If kyuubi wasn't there then yondaime wouldn't have died and he would teach naruto everything he knew. Plus, it takes a considerable amount of chakra to keep the kyuubi sealed.
2- No. Kyuubi has helped Naruto out of tight spots such as chuunin exams, battle with sasuke and etc:-. In addition he would be dead if kyuubi weren't there because kyuubi gives him unnaturally fast healing abilities.
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