From what I have learned, Scotland was actually settled by the Irish. The Scots are mostly Irish genetically.
Scottish Gaelic is just heavily accented Irish Gaelic for the most part.
Yes an Irish tribe, the Scots or Scoti settled the Western Islands and the Highlands. Lowland Scots are mostly who made up the Ulster Irish. Although the Highland Scots seem to think they are better, I think history shows the Scots-Irish were just as tough.
Incorrect. Two linguistically distinct peoples. Scots came up from the Mediterranean across Northern Europe and Scandinavia into Scotland. The Irish bounced up the coast of Spain and around to Ireland