«وَالْإِيجَازُ ضَرْبَانِ»
Concision is of two kinds.
Ījāz al-qaṣr (إيجاز القصر) compresses a wide meaning into brief wording without deleting a required element. Ījāz al-ḥadhf (إيجاز الحذف) intentionally omits something, while linguistic or contextual evidence allows its recovery.
A useful question is whether an unspoken element must be supplied to understand the intended construction. If it must, examine ellipsis; if not, but the short statement embraces wide implications, examine concise compression.