Naruto is a jin Rikudou with full Kurama, something that he has never had before. There is no need to go full Rikudou with all bijuu when he has the ultimate bijuu at his disposal. If the enemy can't handle him with the full Kurama/Rikudou then they're not going to be able to handle him in full Rikudou with TSB.
Until an enemy can come harder than Rinnegans in his hands and a wedding dress, then he won't need to go that far.
Until an enemy can come harder than Rinnegans in his hands and a wedding dress, then he won't need to go that far.