The story about Oona’s cousin is more foreshadowing evidence that Redcloak is not following the Dark One’s true plan.
Interesting that Redcloak and Roy have the same flaw; they both have a strong tendency to feel that what they assume is true is a fact and to dismiss any other possibilities. Roy, at least, has gotten somewhat better and is occasionally able to step back and check his assumptions. Redcloak is still stuck in this.
The thought occurs to me: When Redcloak eventually dies, one way or another, if we see it happen in the strip… I think we might literally see him walking over the bridge from Right-All-Along into Doing-Very-Best-for-Goblins. Is real places! Is trying to go to villages! They are real!
If he’s just doing Detect Evil, won’t Belkar mess up the scans? He’s not evil enough enough to “linger for days”, but the Order is much more recently in the area.
The gap for a lingering aura is up to an hour for “Strong” evil and potentially six days for “Overwhelming”. I doubt Belkar, at his worst, even rose above “Moderate” which is in minutes. However, I had the impression that Team Evil has been here for a week or two at least so the best Redcloak could do is confirm doors they were in recently. Older ones would need to be rechecked for monsters since Xykon’s aura would have faded.
I see Oona has exited the save without noticing the trap. Even if Redcloak started using other detection magic to try to solve the marked door issue, it’s likely he’d skip that door since they just came out of it.
Belkar is just an ordinary evil creature, somewhere between 11 and 25 HD, so his aura is only moderate. Xykon is an undead of 21 or more HD, and Redcloak is a cleric of an evil deity of level 11 or higher, so both are overwhelming.