My Thoughts on Background Alicorns

Let's face it. We have all seen background alicorns from time to time, and we all assume that they are well, a mistake. BUT- What if they aren't?

My theory I that there are royal alicorns, such as Celestia, Luna, Cadence, and Twilight. Then there are the offspring of a Unicorn and a Pegasus. They have wings and a horn, but are not royal.

But of course, that is just my idea.