Why explain ilā amwālikum through maʿa amwālikum?

Bayān al-Ibdāl: Verbs, Nouns, Particles and Sentence-Level Meaning

• To derive every zakāt rule from this phrase
• To clarify the prohibition on wrongly absorbing orphan property into one’s own
• To prevent any transfer of one’s money to an orphan
• To interpret amwālahum as the orphan’s children