Yes the Rinnegan has the capability of using all the paths.
But being capable of using the 6 paths doesn't = knowing how to use the 6 paths.
Sasuke only know outer,deva and to a small extent preta.
Sasuke doesn't know how to use Asura,naraka,human, or animal path.
That's just simple fact.
Gaining Rinnegan doesn't automatically give you a 101 lesson on how to use all the paths.
You have to be taught. The same way Madara taught obito.
But being capable of using the 6 paths doesn't = knowing how to use the 6 paths.
Sasuke only know outer,deva and to a small extent preta.
Sasuke doesn't know how to use Asura,naraka,human, or animal path.
That's just simple fact.
Gaining Rinnegan doesn't automatically give you a 101 lesson on how to use all the paths.
You have to be taught. The same way Madara taught obito.