there was certainly some persian influence there and no one really knows where the dorian came from so who knows. i always found it fascinating the greeks coolest hero was a dude named "persian"... pereus.    there were basically two groups on the area at the time. the eef who represented the non ie and the ie/eef mixtures like the myceneans and carians. the word dan is an old ie term for a river. so they were just the later group.  i agree the various ie groups were steppe ppl that conquered eef and mixed with them.
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