Merseth: "ROY! Do something!"
After this, admittedly you become more active. However initially you did side-line your character so you could focus on Nightmare. Except for they didn't go away anywhere they just were kind of twiddling their thumbs for a bit.
I'm going to just try to make objective statements, or subjective statements that I think most people will agree with. Common sense stuff:
If the hostpc is not removed or made a story device...
-Host updates blend in with hostpc gameplay (they look the same!)
-Each role takes work, doing both means some resources are not going to story telling (math)
-Using a roll honor system others are not*
-Either
A) You know plot devices others do not, and must avoid metagaming in a way they couldn't possibly do*
B) Improvise and do not take advantage of the beneficial uses of planning and secrets (often at the expense of the long-term experience)
-*Your roleplaying experience is different than everyone else's, even if you succeed in portraying your character the same
I dare say that after a host swap when the former host does return to committing to their player, often the experiences it's like their player character has been asleep in there just waking up. This is either external as if the player has not been very active and they are suddenly back on duty. Or it will be internal as the host can suddenly put 100% into role playing and experiencing the world from their character. It will be jarring either externally or internally maybe somewhere between but it will have its effects.
I know this I did this a lot. I am literally criticizing a younger version of myself in everything I've been saying.
But this kind of jarring aftermath doesn't have to go to waste in fact you can use that energy. If your character had been away from the group or if your character's involvement in the story had been temporarily changed, then it would make sense that there's a little bit of jitter as they get back into the adventure role that they had before along with the main cast. That would make sense you wouldn't have to fake it which you would feel you are doing, and it wouldn't seem odd because it makes sense for the story.
(Edit:spelling)