Sith Empire Zetas

Blubcop

Which are the 4 most important zetas in a sith empire team?

I thought of Drevan lead and both of Malaks.
Are there others that are absolutely needed?

Sanderzas

Drevan lead, drevan (the one that you can't assist against him), and both malaks.
The 5th and 6th depends on where you use it. Bastila zeta was not that great when DR was meta, because potency and foresight didn't matter in DR mirror, but with geo TB and a lot of other stuff bastila is the fifth in my opinion and then DR the last unique