Board Thread:Versus Debates/@comment-30426414-20170308222740/@comment-30426414-20170313062045

UltimaDude wrote: The rate in which CT attracts rubble stays the same without the user's concentration.

You're right, the CT will grow to a certain size without the users intervention besides from the original hand sign. But after the aforementioned size is reached, the users intervention is needed to increase the size of the CT. Thats the same scenario with naruto and sasuke, If sasuke intends to keep naruto trapped, he needs to be concentrating on the jutsu to continually add rubble in order to keep naruto trapped but he can't be concentrating on it while fighting 3-4 kurama clones.