CAN kakashi defeat any bijuu ????

[Reborn]

Apart from in his dreams, no

This is true.

 

[lanakau888]

maybe a wild, lower-tailed bijuu. Deidara and tobi defeated the sanbii without much problems. Kamui should be effective against a large target especially since wild bijuu shouldn't be intelligent enough to dodge.

 

[Hushabye]

Sadly.. Kakashi couldn't handle one of them on his own.