Your topic question reminds me of the coelacanth fish, similar to the lungfishes with fins in the areas of the body where legs would likely be if they evolved, all of which would seem to relate them to tetrapods, allegedly the first vertebrate animals on earth.
These fish, thought to be millions of years extinct, exist with fins in tact on earth today, having adapted from fresh water to salt and having adapted the lung somewhat to a deep water purpose. They relatively recently found them again as we are all aware. They are closely related to lungfishes, as well as having fins located where legs would be. This all could be and once did relate them to linking the alleged first tetrapods, too, tetrapods being the alleged first vertebrate animals to walk the earth.
Perhaps the ostriges which don't fly could be analogous to the coelacanth which after alleged millions of years still does not walk, still having lung-like features and having fins where legs would be had it evolved.
From what I understand, science once applied the coelacanth to the evolution debate but have had to scrapped that. Likely, like the coelacanth, the ostrage has always been basically what it now appears to be, an intelligent designer having designed it to be useful, unique and for other purposes the designer has for it's existence.
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