Siddhartha Gautama wasn't a great human being.He was as ordinary as us.He learned from trial and error.He learned through tough self-discipline and renunciation.He learned through attachment.Buddha has said we humans are too capable of being Buddhas.There are examples of orinary individuals who have tried to live their life like buddha and experienced enlightenment. There is nothing within human reach.The potential of this flesh and blood may be limited but potentials of our human spirit is vast.Its eternal.There were many Buddhas who were born and died before and after Siddhartha's presence on earth.We don't know them doesn't mean they didn't exist. The beauty of life is we as humans are provided the same conditions for all.it's our choice whether or not we want to bother ourselves in trying to explore that sacred side of our soul instead of living a mundane life. You have mentioned theory looks good.I have never discovered the simplest as that of respecting human that is much easier to implement.I think political theories like that of Marx and economic theories of Adams Smith are hard to live.But the the theory of respect and love of human dignity is much easier to follow.The big eat small concept or darwin's survival of the fittest is the result of Wetern world's ego for their dominance and recently resulting in America's strike on a sovreign land of weaker nations for their love of consumerism.