General Grievous

Here's how I'd rank them.

1. Grand Moff Tarkin

2. Orsen Krenic

3. Mother Talzin.

6. Morgan Elsbeth

Who's Thrawn and Baylen?

Not knowing who Thrawn is is crazy

Of this list, Thrawn; of all time, Nom Anor. Totally awesome villain.

Thrawn is better than any Sith Lord imo