As a judge... It is really difficult to have a comprehensive list of 'fatal flaws'. What might be inexcusable to me might be tolerable to somebody else. No flower is perfect, so we will often deduct points for various 'flaws', rather than just eliminate a flower from consideration. I'd say some judges would have a serious problem with the color break. Some would consider it 'pointable' (in the sense that you would deduct points). I'm afraid some judges might not even notice... Judges are humans too, and we don't always see everything. A truly impressive flower (either large, or excitingly colored) might overwhelm somebody's interpretation of various flaws.
For me, personally, I would have to see the whole flower and compare it to the other awarded flowers (there aren't many, I think). I don't like judging pictures of flowers, so this is just my first impression. That color break might not even show up in person, sometimes the camera reveals flaws. I like the overall color a lot. I like the form, it is nice and round and apparently fairly symmetrical. I like the dorsal being a contrasting color. I like the petal shape, it isn't nearly as reflexed as most of the kovachii I've seen (in pictures, as yet I haven't seen a live one). That may change with age. As noted, I do not like the color break, but it is a fairly small region of the flower and could be purely mechanical, I don't think it is fatal. What I don't like about judging single flowered plants is that you can't see if there is consistency between the flowers. For slippers we often only see one flower.
That is just my personal opinion. You'd have at least another two (and maybe more) judges on the team, you never know what they will think. Whatever the outcome may be, you never know unless you bring the plant to a judging. You are often your own harshest critic. The flaws you see might not matter to the team that looks at the plant. Worst that can happen is that you don't get an award, that is what you were expecting anyway, right?