So just to be clear on this? Your argument is based on "What If's" and mine is based on actual records. If our history books were written the way you seem to want them to be then man our kids would be full of miss guided knowledge. You do realize that there are species of animals that have yet to be discovered right?
Just a few weeks back a whole new snake species was discovered. That was the first time that it was ever found.
Based on your theory there are no new morphs because they have all been found because it is impossible for us to not have found them yet. Well i guess there goes a lot of people hopes and dreams of one day discovering that new morph.