The Kobolt Oracle?

[The Pilgrim]

The only relevant piece of information Roy mantained for bypassing the Memory Charm, was the knowledge that Beklar had murdered The Oracle and triggered the Mark of Justice. Since that plays to the Oracle's advantage, logic dictates that the Oracle would be interested in letting Roy bypass the Memory Charm by banishing his spirit.

Therefore, the so often invoked argument that the Oracle isn't omniscient because he didn't know Roy would bypass the memory charm due to the banishing, is faulty. If the Oracle had looked ahead, he would have still banished Roy's spirit. Assuming that the Oracle didn't, in fact, look ahead, and banished Roy precisely because of that.