Memes

I'm suggesting the the stars above give the bear a more bearlike than equine appearance and might have been involved originally.

And I'm saying you want it to look more like a bear because that's your idea of it today. It is a bear because it has been a bear for over 10,000 years. The 3 extra stars were not part of the bear itself, but still part of the constellation as a whole, and they were never separated because the dipper shape is recognizable and important. Those other stars you want to add were not part of it - as far as anyone can tell from the surviving versions. It's not a mistake, it's not something that was forgotten. Your suggestion is an addition that was never there, because you want to fix it to your modern underestanding of the constellation.