lol what? He armored Susanoo onto Kurama just like Madara armored his onto Kurama. Where are you getting them being enhanced from? Cause that is just a baseless assumption tbh.I would have to agree. Whilst Sasuke obviously has the capacity to use it, the only actual time we saw any indication of it was when he synced his chakra with Kurama's. Similarly Madara's Perfect Susano'o was enhanced when he merged with Kurama.
If Sasuke had PS he'd've squashed Madara when he had the chance.
Sasuke has PS and he's already used it without anyone's help. Manga has made this clear.