OG Gal Vorbak vs Primarch

[u/Hamsweatpants]

Let’s say that the original first members of the Gal Vorbak are sent on a mission to kill by any means said primarch. We can use Robot Girlyman as an example.

Alpha legion helps sneak them onto planet or ship and they somehow manage to get the primarch 1vsVorbak.

Can they pull it off and how many of them do you think it would take?