1. It was an example with scale itself not senjutsu related
2. This thread is about sasuke absorbing high scaled ninjutsu like TBB or TBB Rasenshurikens.
3. I know, that's why this thread is theorizing about sasuke using petra within his susanoo and use his susaso'o as a container for all of senjutu absorbed since his susano'o was able to adapt to juugo's senjutsu chakra.
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It was Juugo that allow nature chakra to flow and embed with Sasuke susanoo. We have never seen any senjutsu that wrap around Sasuke susanoo after that when Juugo no longer be there. That is why the author very carefully make Sasuke ask for Juugo to apply cursemark/nature chakra on Sasuke susanoo.
Also Juugo can not produce nature chakra on same level as Hashirama or Naruto. Naruto kneel up nature chakra from all the surface, that is far stronger than what can Juugo ever done.
Even if we asume your logic that rasenshuriken is based on senjutsu and Nagato can absorb it. But when he get more senjutsu, he turns into stone.
Same to Sasuke, he can adapt a small amount of nature chakra from Juugo and with his help too, but if he tried to absorb senjutsu attack that was said contain all nature chakra on the surface then his fate will be same as Nagato.