So, trust no one with the information.
But investigate any potential Tzeenchtian Schemes by our lonesome, to try to validate the information ourselves. Basically, putting us against a Greater Daemon and Servants with no potential back up? Because that sounds like a Very Bad Idea™️.
Also, you seem to be making the assumption that you positively 100% know what this Daemon's agenda even is. As has been stated many times before, we don't know what it wants, and it's possible opening up communications with trusted friends and allies will negate its plans. So, stating that by telling others we are advancing its agenda is kinda misleading, because we don't know.