Really the way the Novel version went down is a dang shame, pure cancer so that Drew can wank his character above the KOTOR 2 challenger.
Meetra bonuses to the team:
1.) Force Bonded / Force Chained to Traya
- This gives a power amp to both.
- This allows sharing of beneficial powers (Surge as an example), which leads to dozens of combat tactics.
2.) Meetra (as criminally ignored in the novel) is an advanced telepath:
You are strong indeed.... what you heard were surface thoughts only, but it is something that masters have trained for for years and never learned. (KOTOR 2, Kreia Telepathy Training Session)
And telepaths can do this during combat:
"In combat, telepaths do have a distinct edge. Even if one fights by instinct and reflex, most cannot stop themselves from emitting monosyllabic thoughts that project their next movement. During my training bouts at the Jedi Temple, my opponents unwittingly revealed their every move, allowing me that crucial fraction of a moment that enabled me to be the one who would remain standing." - Jedi Master Saesee Tiin, Jedi vs. Sith - The Essential Guide to the Force
So the duo is going to always be one step ahead of Nyriss.
3.) Related to point 2, Meetra and Traya have a telepathic link and Meetra can communicate Nyriss' next move and make a plan of defense/action.
This isn't going to be a fight like the Revan/Meetra abomination. Nyriss is taking a dirt nap quick fast and in a hurry.