The most powerful being in Star Wars: Anakin Skywalker who lost to Obi-Wan, ruined his chances at reaching his peak. This resulted in him becoming a lesser version of himself: Darth Vader.
Why wasn't he ever cloned? Palpatine didn't clone him...but someone...or rather...some THING did.
Here's the legends story (not canon) from when George Lucas owned Star Wars.
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