I wonder if the author will actually stick to that evaluation. I'm betting he either:
- Finds a way to expand the number of spells he can learn.
Either with the help of the "chickens" or his poison immunity. Or both... the chickens could pick some plant for him that would normally be be deadly poisonous for anyone else.
- The priest saw he could learn "002" spells.
Meaning there's a 3-digit limit on the appraisal ability, and MC can learn "over 1,000" spells. It might only be 1,002... or it could be 1,000,000,000,000,002 spells.