4 Tailed Naruto uses power equivalent to the Kyuubi only using 4 tails worth of power i.e. less than half.
6 Tailed Naruto uses power equivalent to the Kyuubi only using 6 tails worth of power i.e. quite a bit above half its power.
KCM Naruto uses power equivalent to the Kyuubi using all 9 tails, however he is unable to use the Kyuubi's maximum potential.
Bijuu Mode uses all 9 tails to its maximum potential.
Re: How powerful are these 9 tailed transformations????
Yes he did. He already did his body stealing thing before shippuden even started, so he could use his arms. He used a summoning jutsu to use the rashomon gates. Explain to me how he couldnt use jutsus if he used summoning?