No doubt. I just wanted to emphasize that this sort of apocrypha adds color to our understanding of the series, but we shouldn't take it that a specific alternative choice could have been made. The producers were interested in Siddig as captain and in Grodenchick as Quark. And while they invited Siddig to send an audition tape, it's clear from Nemecek's notes and recollections that Brooks was the leading candidate as soon as he auditioned. Auditions are still an extensive process, and there is always the hope that someone better will walk through the door.
Personally I find it hard to insert Robinson as Odo. He wouldn't play it like he did Garak, of course, but I do feel something would have been lost.