I'm not talking about it happening all at the same time. Nevermind that point, its irrelevant to the discussion, and actually is just a matter of opinion. For you, it could have happened because it did, for me, it couldn't have happened because we still don't know of any mechanism where its possible. So, whatever.

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In evolution we have the first case. Eyes don't pop up suddenly but develop step by step. Mutations permanently happen. Some of them will get the eye one step further - maybe one mutation in ten thousand years.

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Your evidence for this is?

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Thus it would be unthinkable if eyes had _not_ developed many times in many species during evolution.

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Assuming the goal of evolution is that creatures without eyes should get them. And that its even possible in the first place, which has never been demonstrated.