Hrm. This is an issue. There is no guarantee that I'm not framed or converted at night or that Nat/NW won't be converted at night. Observer is hopeful but we can't be too reliant on roles we don't know are included, we have 2 Invest claims already after all.
I'd say that anyone we tell Invest to look into will be tampered with before the results come back to town. I also can't promise I'll be town tomorrow, if I'm hit by Cult tonight. It would be a false-clear in that case. Same if you were invest'd. It's best if
@NeutralWatcher and
@Natalija don't tell us who they invest until we know if there's something like observer out there.