"Edward! What does the scouter say about their power levels?!"
"I can take them. Maybe? I shouldn't assume."
Remember, Pandora "I caused a global event that changed the course of human history" Raven was a MASSIVE exception in terms of power.
That said, when you don't actually test how well you'd do on average against magical immortals (because why would you?), you can't actually be certain who well you'd do on average against magical immortals.