cool, I am not sure if the bene-gesserit reverend mother does the trip to Caladan with the help of the guild as it is implied that this will be done in secret. The tip off was from listening in with her powers from outside the room.

This seems to be an independant act on behalf of their faction to test Paul in secret unbeknowst to the emperor and the space guild.

So this trip would be clandestine I feel similar to the Guild visiting Kaitain.

So they must have secret Navigators and perhaps this is where the 2nd stage navigator would have featured perhaps.

If they wanted him dead perhaps caution was urged or obviously some sort of plot point is amiss wether it was done in knowledge of the guild or not