As a fan of those other Hydra Brothers from GW, I thought I was in for some infiltration goodness. But I got Grin-dark instead.
The melodramatic villain bit was the first cue that something comedic was going on here. Probably now my favorite entry so far. Not gonna lie. Seen this in a comedy skit somewhere... with shapeshifters or something, but here its good enough to count as original in my book, cos its comedy without resorting to greenskins. So pat that writer on the back.