Just thinking, naruto cant form a rasengan without in normal mode but can in sage mode and everytime naruto gets angry instead of his power to increase due to his anger the kyuubi just eats up his anger and take over him. The 4th absorbed half of the kyuubi chackra and said it was a very heavy chackra and his body was going nob That makes me ask the question is the kyuubi a draw back to narutos power