I guess i am just confused by the term "ordinary" in reference to Siddhartha Gautama pre-awakening. He was a 10th Bhumi Bodhisattva on the verge of full awakening the moment he entered into this world. This is accepted by Mahayana Buddhism, and many Theravada Buddhists accept he was on the path for eons as well.
I hear what you are saying, and I don't discount that understanding. I can see validity in it. While that may be the history of eons, all of us as "ordinary" people in this world all come with our own karmic histories in tow behind us. Being born a human, each one of us have to transverse all the normal stages of development.
That karmic history in tow behind us will be there with us through that, as well as our own inherited stuff in this life through our families and culture at large. The history alone from before this life, is not the sole factor. The "ordinary person" born in this life, with this personality, with these parents, in this culture, against these adversities and supports, still must find our ways through the maze of this entire play, from the aeons through this life to the next.
While he was karmically 'special', he is not out of the reach of anyone of us. We too are born to this life as he. And we too can realize the truth of it all, as he. I don't discount the mythologies, as I see them as a "decorated" painting of a much more subtle reality of all of this, than the literal magic displays to awe others with you find in the fabric of myths. These are fine, but it's good to see what they are about that can, and does exist in all of us, realized to one degree or another.