The Grand Master Templar Grand Masters are veterans of hundreds of battles and strong in their faith, so they are Immune to Psychology. In addition, as long as a Templar Grand Master is with a unit of Knights of his Order, the Knights are inspired by the presence of their Master, and so are Immune to Psychology as well.
Crush the Weak Ulric detests weakness and cowardice. This character and any unit he leads hate models with a basic Leadership characteristic of 6 or lower, even if normally Immune to Psychology. This has no effect on other characters in the unit or on the model's mount.