What is the main Ashʿarī objection illustrated by the three brothers?

Salvation of Children: Aṣlaḥ, Recompense and Theological Differences

• Proving imagined actions count as a child’s actual sins
• Proving all kalām schools held an identical understanding of aṣlaḥ
• The asserted rational obligation to provide an individually optimal outcome faces a challenge
• Proving divine knowledge extends only to adults