Mod Farming with incomplete options

zFinn lead, Poe, RT are mandatory. You need Finn's zeta to get the expose train rolling and Poe to expose as many as possible plus remove TM. RT exposes on basic.

RP is recommended since she exposes on special.

The last spot is really up to you and somewhat dependent on where you're using them. sRey has the Res synergy but she doesn't expose and has no utility (unless you do her daze zeta, which most people do not AFAIK). In general R2 would be a better choice thanks to his stun and smokescreen.