If there was no need for Susano’o then why, in that same scenario, did Madara use Susano’o’s arm to shield himself from Tobirama’s “spit” as opposed to using Limbo? Your logic is flawed, Madara’s limbo clones not using Susano’o was there as an advantage for Naruto and Sasuke to not be decimated. The fact is, it isn’t stated that Madara’s Limbo clones can’t use Susano’o or jutsu of any kind for that matter. It’s not a comparable scenario to when Juubito couldn’t use his MS ability because it was explicitly stated that he couldn’t.
Also, refer back to my first scenario where I talked about Sasuke and Madara kills DMS Sasuke. Nice chat.