About 8,000 Arvanites leaving Peloponnese mostly with their families false that is written in Wikipedia is completely false.
"La loro consistenza numerica andava da circa
7.500 unità originarie a
8.234 nel 1570 ed a
8.958 nel 1589. E questo quando la popolazione complessiva dell'isola non arrivava in quegli anni alle 800.000 unità."
"Regno di Napoli - 5.775 people in 1540."
A total of ~13,000 in mid 16th century which could amount to 12,000 settlers. Given that 3 out of 4 waves were from Albania (with Kastrioti) and nearly all of the settlements were established by those refugees from Albania (*) I'd say it is much more likely that the vast majority of them came from Albania and not Peloponnese. Proportionally 12,000/4=3,000. The number of Arvanites that left Corone was 2,000. And for other Venetians strongholds like Nafplion or Argos they were either included in 2,000 (**) (migrated to Coroni first before leaving Morea) or did not migrate to Italy at all. If neither of those is true then 3,000 seems a good bet to me.
(*) - Piana Degli Albanesi, the most famous Arbereshe settlement was founded by Himariotes later joined by Corone and Medoni Arvanites. Those Arvanites also created some villages of their own or joined them if I recall well (but not sure).
(**) In 1532 the Allied Fleet of Charles V, the Pope and the
Knights of Malta under the command of the Genoese Admiral Andrea Doria, seized the city only to abandon it in 1534, taking with them
2,000 inhabitants,
mainly belonging to the Arbereshe (Albanian) community. They settled in southern Italy where already other Albanian refugees lived. They never forgot Corone and Morea as their songs testify.