Board Thread:Naruto: The Last Discussion/@comment-25824723-20141207101850/@comment-945885-20141215030434

He has fewer Truthseeker Orbs because several were lost in Kaguya's dimension. They work like physical objects and can't just be regenerated. When they are beyond a certain range, Naruto can no longer control them, so he can't recover them. They have nothing to do with the tailed beasts.