Did Mufasa banish the Outsiders?

I once heard this in TLK book where 'apparently' the Outsiders were already Outsiders even before Simba banished them to the Outlands. Scar 'was' apparently going to use the lionesses to help him but Mufasa had banished them and Scar had to use the hyenas instead. And it does make sense, The quote 'My father's law will prevail' could've meant this. If this isn't true. Then what did Simba meant about Mufasa's law? I don't recall him ever speaking about any such law expect for the hyenas. Though it'd make sense that Mufasa would exile the lionesses since they were cunning and murderous like their King. But it's possible Scar allowed them back in the Pridelands when Mufasa died and their loyal devotion to him? 
