Alright let me break it down a bit what I intended with this and why some of those can't work.
1- It's possible but it could also be something different.
2-IH could have seen fish visit by chance in which case nothing is gained or lost. Now in the case that it's town there is actually a variety of different roles that can visit, I admit first thought is doctor or Cop but in the case that IH is telling the truth and visitor is town, that means we have a way to keep said individual watched for at least a full night as we don't seem to have any RB'd claims yet and it confirms that IH's claim is truth and that -Rosen's claim is more suspect.
3- If IH is telling the truth and the vistor was scum and lied, that means we have 2 scum in the open for us starting the next day phase, scum can't afford that with 1 crossfire already seemingly(Ah the curse of SV...scum crossfire)
4- town!IH has no reason to refuse to answer for these reasons of accurately catching scum. And in terms of having a scum buddy claim to have visited well same above, 2 scum linked completely.
I'm confidant IH is telling the truth, so in reality this generates more info for town than scum, and the only times that people lie other than -Rosen in this situation results in scum linking themselves too hard to each other to warrant the value.