Ideally zKRU, zFOST, FOO, FOE + zKylo. However, in raids you can easily swap in a fast Phasma for zKylo as you're essentially using those two to hand out turn meter. AI on defence doesn't use Kylo correctly and tends to spam Outrage instead of Lash Out or uses the wrong one at the wrong time, so you lose all the extra TM. I've posted very similar scores using either Phasma or Kylo.
And a zeta FOST is a HUGE change to an FO team.
The first mentioned lineup can solo P2 or P4 of NAAT, and can do 50% of P2 HAAT. They can also solo HPit in 15 minutes with the pigs and the Rancor never taking a single turn.
I haven't run them in P4 HAAT yet as I have ABC for that.