Perhaps counter-intuitively, Obi Wan is the hammer, while Ani is the anvil in this list.
With Hello There, Obi is able to get movement and extra dice. Obi pushes forward with Rex in support, and the 212 hold the line by shoving and pinning.
Ani has a more defensive role, until a juicy Secondary target appears. Barriss is actually a distraction piece. Her role is to either move in to supplement your Primaries as they attack, or to be a trap target. Remember Faithful Padawn triggers even is Barriss is wounded, and it's always free. Her multiple ways to Reposition allows her to be a mobile +2 attack dice for your Primaries.
ARFs are there to soften targets.
