Minato's rasengan lost it's juice after his arm was cut off.
Sage chakra or not, Rasengan needs to be actively controlled until the point of impact, if not it will rapdily lose it's power and momentum.
If you're saying there's no difference between an actively controlled rasengan and one that isn't controlled then you're wrong.
You're picking at the fact that it was infused with sage chakra as a basis to say Susanoo would tank it.
Even if it was true and Susanoo could tank any SM Rasengan variant, Does it really matter when BSM TBB's can bust Susanoo?
If the tails of a BM/BSM can bust a V1 Susanoo?