Let me see if I follow you - if it's about the same size as an ostrich, it must be an ostrich. That's your argument? You are aware, I suppose, that an ostrich only has two toes, not three, right?
Or... maybe the 165 million years is a bad determination.
Could be. Got any evidence of that, or just wishful thinking?
You probably think that humans at some point lost their tail.
Evidence.... well .... we've got foot prints.
I don't think we have any evidence of that yet. Now if they find skeletel remains.... then we'll talk. :)