I don't fully recall, but do IRROPS passengers get higher priority than A List folks? (I seem to remember threads several years ago with different levels of standby priority people based on IRROPS, status, etc, but can't find the thread - it's possible that I might be thinking of another subforum though)
My understanding is that they do*.
ETA *but that that they would be added such that they'd be higher on the list than A+/A list pax on the list before clearing.