And just by looking at the Susano'o armoring Kurama, you can tell that it is a PS; Databook listing it as a Susano'o technique instead of PS technique doesn't disprove that either, as PS is Susano'o. Databook lists Madara as the only PS user, when Rinnegan Sasuke and DMS Kakashi already displayed PS standalone, which proves that Madara being the only user is wrong, so it's not enough to disprove EMS Sasuke having PS.
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This is the most powerful version of Susanoo Sasuke used without the influence of Juugo or Kurama power. This is EMS Sasukes peak Susanoo. This is PS. Sasukes version is just not as strong as Madaras because like I said, Madara was more seasoned with his EMS powers. I'll try to break this down simple.
This is Madaras legless v4 Susanoo:
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I'm sure you can already tell its larger than Sasukes in the earlier link I posted. Way, way larger actually. Why is this? I believe it is because as I mentioned in a previous post, Susanoos power is based on the users chakra. EMS Madara chakra is way larger and more potent than EMS Sasukes for starters. EMS Madara has more experience in using Susanoo. These factors are why I believe the size difference between them is so drastic.
Sasuke would have to exert a large amount of chakra to grow legs on his v4, possibly an amount he didn't have, or couldn't afford to spare until he got Juugo and Kurama chakra. This wasn't a problem for EMS Madara though, he was in his prime and his chakra was immense. Learning to stabilize a construct that large would be hard for Sasuke. He had just awoken his EMS powers and was still testing them on fodders like Zetsu and the Jubi minions so this was new to him and he would need some practice (Jubito Fight) before hand. This was not the case for Madara as he had EMS for years then.
The manga has showed that the only times legs were formed on Sasuke Susanoo or complete PS was when he was empowered by an outside power (Kurama, Juugo, Hagoromo). The only logical answer we can come to is that chakra was the problem for him and the reason why he's so featless with PS in EMS form. I use to think he never had PS but after doing a lot of research myself, I'm convinced he does have it, but he can't use it to its full power because of his little experience and little chakra and even if he did, it still would be a far cry from Madaras for those same reasons.