Priests DEFINITELY should be proxying results; even negative results saying that certain people didn't kill brunnerj are very good (they can't be manipulated by mafia powers in the way investigations can). Roleblockers probably should proxy out too, unless your roleblock target was already alibied. And of course, planeswalkers planeswalking into a pair investigator, priest, or roleblocker, should proxy out.
The spirit search results are not that strong (mafia can use two of their spirit searches to make it give a random result), and are strictly weaker than confident single-player alibis. They're probably also worse than weak single-player alibis and investigation results. See this spreadsheet for color-coding of alibis:
https://docs.google.com/spreadsheets/d/ ... d=28451269