Not so.
Edmund Ironside (House of Wessex)
.Edward Atheling (Wessex)
..Edgar Atheling (Wessex) no children
..St. Margaret of Scotland (Wessex)
...Edgar King of Scotland(Dunkeld) (No kids)
...Alexander I King of Scotland(Dunkeld) (No Kids)
...David I King of Scotland(Dunkeld)
....Henry of Scotland Earl of Huntingdon
.....Malcolm IV King of Scotland (No Kids)
.....William I King of Scotland
......Alexander II King of Scotland
.......Alexander III King of Scotland
........Alexander Prince of Scotland (died young)
........Margaret Queen of Scotland
.........Margaret Maid of Norway (drowned)
......Margaret Countess of Kent
......Isabella Countess of Norfolk
.....David 8th Earl of Huntingdon
......John of Scotland Earl of Huntingdon (no kids)
......Margaret of Huntingdon
.......Christina of Galloway (no kids)
.......Devorguilla of Galloway
........John Balliol King of Scotland
.........Edward Balliol of Scotland
........Eleanor Balliol of Scotland
.........John II Comyn
..........John III Comyn
still have work to do, but TRUNC
...Matilda of Scotland(Dunkeld)
....William Adelin (Died in White Ship)
....Matilda I Empress of England (Anjou)
.....Henry II King of England (Plantagenet)
......Henry the Young King (killed)
......Richard I King of England
......Geoffrey II Duke of Brittany
.......Arthur I Duke of Brittany
.......Eleanor of Brittany
......John I King of England
.......Henry III King of England
........Edward I King of England
.........Edward II King of England
..........Edward III King of England
From what I can see:
From David 8th earl of Huntingdon:
Margaret of Huntingdon -> Comyns -> Lancastrians -> John of Gaunt and then merge with the subsequent lineage.
This lineage is the senior lineage to Wessex.
John of Gaunt
.Philippa of Portugal
..Edward of Portugal
...Afonzo V of Portugal
....John II King of Portugal
.....Afonzo Prince of Portugal
..Ferdinand Duke of Viseu
...Manuel I Duke of Portugal
....
Margaret of Huntindgon Duke of Norfolk, both lines still in existence. The Comyns are at present
Isobel of Huntingdon -> Stuarts -> Merges back into the Jacobins. :)