Do not conclude that removing ال always deletes the final ya. The case state matters.
- Indefinite nominative: هَادٍ — ya is omitted.
- Indefinite accusative: هَادِيًا — ya remains and tanwin fath is written.
- Indefinite genitive: هَادٍ — ya is omitted.
Why the contrast? The deletion rule applies here to nominative and genitive; the accusative form visibly retains ya. This prevents the common over-generalization “no ال means no ya.”