I'm going to try to spell out why I think Bodyguard is a better choice than Loremaster-At-Large, given how similar they are in many respects:
• The Empire needs a troubleshooter more than the Dwarves do. To use a mining metaphor, the Empire still has many rich seams of problems for us to mine through, while the Karaz Ankor is a lot more tapped out. The Empire has a great deal of immediately active problems for us to work through, and trying to bring some unity back to said empire is an excellent cause.
• It means more Ranald. This one is pretty self-explanatory, but I expect the Heidi and Mathilde show to have quite a bit of Ranald shenanigans going on, and that's fantastic because I legitimately like Ranald as a character in this story.
• It means seeing more of the Colleges. Instead of being half a continent away, we'll be right in Altdorf a bunch of the time - and that means seeing a lot more of Algard and the rest of the Grey College than we have before, and gives us an easy in into more inter-College shenanigans as well, including the whole Horstmann subplot.
And, finally and most subjectively...
• It's a change of pace. Belegar's great, but I don't really uh, want to see "more of the same, but smaller in scale now" at this point in the story, when there's other compelling alternatives. We aren't going to be pulling more stuff on the scale of K8P or Vlag, the dwarves are too spent for big projects for decades to come, so this is going to be just "ordinary" shenanigans on the scale of the We for years, and I'm satisfied with the amount of dwarf shenanigans we've already done. Let's move on.