Darwin's uncle did seem to have some ideas on a kind of evolution, but never really discussed it enough to know if he had really any ideas on the process that caused it. But he was definitely not the first person to think in those terms. There were people even in times before Christ that believed that simpler life changed over along period of time into more complex life but never really had theories on how.
Darwin believed that evolution happened while populations were large, but this has come into question with punctuated equilibrium theory which believes that evolution occurs faster in smaller isolated populations. Darwin also did not suggest an idea of mutation as the main cause of variation that natural selection acts upon and some of his ideas on how life could become varied were wrong. New mechanism for evolution are being purposed understood as time goes on and evolutionary theory is still be refined today. Some of the mechanisms are very well studied and others are a little more speculative. But many of them are based on details that Darwin could not possibly have known back in his time.
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Who really knows? Who will here proclaim it?
Whence was it produced? Whence came creation?
the One who looks down on it, in the highest heaven, only He knows
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