The only evidence we have that the Dorians came down from the Pindus mountains is Herodotus and he lived at least 600 years after the fact plus he weaves in myths about the return of the Heraclidae. Herodotus is being deprecated as new genetic and archaeological evidence comes out.
Not only,
It is also the Makedonian Dynasty of Karanos,
It is the Spartan system of 2 kings, etc
Even Aristoteles description for Dodona.
and we have archaiological evidence of Brygians from Skodra to Edessa to Mygdonia,
and is just about same time max 1 century.
Dorian primitive dialect belong to NWestern Greek diallects,
They were from the stuff of Dodonaios Zeus from the (S)Elloi,
and most possible is upper Thessaly area of modern Trikala.
the Dorian descent is according
1) Athenaum Historical myth, I think Thoukidides mention Atheneans spoke like Lemneans Pelasgian language, Before the Dorians
2) the 1 of 2 Spartan Kings,
3) The return of Temenides
4) The Makedonian Kingdom dynasty of Karanos and his descent to Peloponese before return to mt Olymp
5) the moves of Brygians
It is most possible that Dorians might be from upper Thessaly as Herodotus say (TΡιχακες-πολη Τρικκη)
Yet might be from Makedonians and Epirotans and 'primitive' Greeks
the mention of Herodotus as Δωριειες φυλλον Ελληνικον
possibly comes from Selloi, (Notice salt - Αλας, Selios - Ηλιος etc reject of a IE sound before long vowels infront the word)
and Ollossoi who lived at the South of Olymp,
only the strong Α is enough to say that their origins were areas of proto-Greek, among NW dialects and Makedonian.
Yet we do not see marks of devastation and battles,
so probably Dorians might starting descent after collapse of Mycenae,
and around 900 BC their nobility ask for the power,
the changes on every day life style, from Architecture to pottery decoration,
is a mark of change elites and entrance to archaic era.
Notice,
North of Olymp
Pier-ia
Mak-edonia
low Mycenean influence
South of Olymp
Perraevia
Mag-nesia
bigger Mycenean influence
More North of Olymp
Myg-donia
now Mycenean influence
Gortyna
Crete
Gortyna
my Aftermath
since Dorian is connected with NW Dialects, which from their part are connected with the very primitive Makedonian,
It is evidence that Dorians due really devastate and descent South,
Yet this started after Mycenean collapse and descent of Illyrians from Noricum and in accordance of Brygians to Mygdonia
and all before 1rst colonization,
But after a time, an elite ask the power, claiming origins from the myth of Hercules,
and prevail to change of lifestyle of wider areas,
So when Temenides descent south to Peloponese,
Dorian population already existed there as paysants and woodcutters,
after Mycenae collapse,
but the new elite claiming ancestry from Temenos,
started rebuild a style, the one called Doric
Temenides started rebuilding cities and restart industries.