And of he stops being useful Palpy will probably sense he is up to shady shit via muh force precog and take him out.
Of course, I am considering Whankarine-level Palpy who is also competent.
Palpy force calls Thrawn and tells him to get his ass to Byss or Coruscant asap and pulls every single nasty trick he had in storage or hidden away in the Deep Core or the Maw.
The rebels die horribly.
And much fun was had by all.