إن جاز تقدير كونه في الأصل مؤخرا
If it can legitimately be construed as having originally occupied a later position.
On this analysis, one asks whether the fronted expression can be reconstructed as a later agent, formally or in sense. Before attributing a specific effect to fronting, the plausibility of the reconstructed underlying order matters.
This is more than casually reversing words. If the presumed construction is not grammatically tenable, an argument for restriction built upon it is correspondingly weak.