Nonsense.
A restoration of the House of Wessex under England's rightful king Edgar the Atheling would have spared our English cousins both the Normans and Hardrada.
This is, of course, why Scotland is the natural ruler of England; Malcolm Canmore's marriage to Edgar's sister Margaret meant that all of the Scottish monarchs from [Malcolm and Margaret's son] Edgar onwards had a better claim to the English throne than the usurpers in London.
Eventually, under James VI/I, we came into our rightful inheritance.