Probably or just an introduction of who he is
well if the princeps knows who he is what do you think his best course of action is?
The princeps is probably the same generation as the MC and can in 50-100 years come to threaten his position since atm the MC is nothing but potencial and not real raw power!
As for the MC rocking the Vampire world if he believes the same shit as Sharon humans might start to loose their position as cattle and be upgraded to pets... i can imagine that would upset most of the old school and many of the lower vampires who only advantage they have it to be above humans... but we all know that humans treat their pets better then other humans so that can create a civil war!
i can even imagine a human defense league amongst the vampires that sows more dissension, i mean vampires who are not rich and have nothing to gain from the status quo but are also not dirt poor (so the middle class in the vampire world so to speak) can not care and start to actually flock to this HDL either from resentment for the rich or disgust for the poor!
You can actually read alot of sociology in this with the black condition during the jim crow era and how small changes created resentment in the top 1% of society and the bottom 10% (of white society)!
So from the princeps perspective he as a potential long term threat but an immediate boost to his power... perhaps a boost enough to revolt against Callisto and win!
or he as a very strong potential boost that he can keep in a county under his rule that he can easily access in a matter of a day or two!
can you imagine the princepts reading Machiavelli line "make common ground and allies with those who are weaker then you against the strong even if you loose the batle you get an Allie for life" - from the prince....