-You didnt understand my point then, ok so you are using it for just defending..after a while your chakra runs out..what next? Why are you mentioning Gaara? I'm not interested in Gaara but since you mentioned a mistake I might as well correct it, Gaara can move about freely if he wanted to whilst using his sand. In fact he doesnt just move he can also fly with it.
- You've just admitted that Susano wouldnt have a chance against the abilities of Rinnegan, which is entirely why I believe Rinnegan has better defensive abilities for obvious reasons. So what if the Rinnegan is rare? In fact you are mistaken on this one, up to now there have been more Rinnegan users then Susuano users. I'm sure you can count who they are.
- What happened to "I wont speculate" ? Until we've seen it actually done by Sasuke's Susano then for now his Susano are legless. As for your Itachi statement, unless Itachi's Susano "stands" on Yata Mirror at all times then he is still exposed.