"I metalevel think it's a good idea if you object-level think it's a good idea.  I have no grasp of pros and cons myself; the judgment is in your hands."

If Keltham got a teleport spell in one of the higher-circle ones he has no grasp of yet - then that will require some plotting later, he guesses, and oh well; it doesn't seem worth making himself more vulnerable in the other possible worlds.  They do not actually need his permission.

"I meta-level think it's a good idea if you object-level think it's a good idea.  I have no grasp of pros and cons myself; the judgment is in your hands."

If Keltham got a teleport spell in one of the higher-circle ones he has no grasp of yet - then that will require some plotting later, he guesses, and oh well; it doesn't seem worth making himself more vulnerable in the other possible worlds.  They do not actually need his permission.