Where are you getting this from? Again you are going around in circles based on the offense a sussano offers, rather than defense.
There first image you showed depicts Itachi and Sasuke's incomplete Susanoo forms, which can be aligned with this:
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Sasuke carries a bow, which can be used as a shield, he has also used an enton sword. Itachi carries beads called Yasaka Magatama, and has Totsuka Sword and Yata Mirror - these function as a sword and shiled - in his complete form:
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, and Sasuke has shown to use enton arrows, and Enton Magatama with his complete form:
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Where does it say that Sasuke and Itachi's Susanoos offer defense inferior to Madara's?