Ashoka performed admirably against Vader - for what mostly was a struggle match for both - on Malachor. The famed nexus arguments can be put forth that would have benefited him throughout the match and supposedly weakened Ashoka. Sidious vs Tano a is going to be one sided, but she might be able to replicate this, for example :
Now for the people - inevitably Sidious fans - balking at this Filioni quote, no one's putting a gun to your head here. You don't have to take authorial intent at face value. There's enough modern literacy criticism to fight that notion - Wimsatt and Beardsley's "The Intentional Fallacy" and Barthes' Death of the Author Essay. I suggest you read them.