His rule was established based upon his victory in battle. His enduring line was due to uniting the factions after the victory.
Tudors were Welsh that came about when Owen married the widow of Henry the fifth, a French princess. No Plantagenet blood at all on the male side. Henry Tudor, Henry the VII, received some credibility from his mother, a great-great grand daughter of Edward III.
By marrying Edward IV’s daughter, he was uniting the Yorkist side of the War of the Roses with his Lancaster heritage in an effort to end the terrible war and solidify his claim.
Dan Jones follows up his Plantagenet book with the War of the Roses and paints a picture of that bloody era.
The Wars of the Roses were very bloody indeed.
As a result of which, even if the Gauntian illegitimacy is a fact, that merely makes Henry Tudor an usurper.
But Henry VIII becomes the legitimate Yorkist king though descent from his mother, Elizabeth of York.
And his sister, Margaret Queen of Scots, continues the York linage in the Suarts.
So no change.