Arabic discourse can express an intended idea through a particle, noun, or verb-form that differs from what a reader might initially expect. The discussion of ibdāl concerns such substitution or altered expression when it is genuinely supported by usage.
An unusual construction should not automatically be declared substitution. The first question is whether the actual word has a recognized function that fits the context. Some perceived anomalies reveal meaningful linguistic nuances instead.
Lexical evidence, syntax, and rhetorical purpose must guide analysis; a simpler translation should not erase the distinctive force of the Qur’anic expression.