The Isle of Man is an important asset. You need it if you are to unite the Isles together as a super-power of the Gaelic west.
Luck is not on your side. You are Somerled, an ambitious and powerful figure. You will not just sit back and hope things go well. Consider playing a more pro-active card.
Offer him limited rule with you as overlord. With your experience this is surely a good option for both of you.
Which card will you play?