Gospatrick of Dunbar, Duke of Lothian, is of a different dynasty to his full brother Maeldred of Atholl.
They are also both share a paternal grandfather (Crinan of Athol) with the King of Scotland, who is of yet another dynasty. (Although wikipedia suggests that the failure of Gospatrick's heirs to claim descent from Crinan when the Dunkeld line died out could imply that he hadn't been Gospatrick's grandfather)
No evidence exists that would to link Crinan father of Donnchad I to Crinan father of Maldred father of Gospatric, except the name. A similar argument would make Henry II the brother of Alexander II, both having grandfathers with the same name (Henry).
Also, it would seem unlikely as Donnchad II married Gospatric's daughter, who would have been his 2nd cousin. Now while this is not unheard of, it is stretching it.
Gospatric incidentally has no known brothers, thus this Maeldred has been made up by the game designers.
Cináed mac Maíl Coluim mac Ailpin dies in 967, three years before his second son, Suibne mac Cináeda of Argyll is born, which though probably just a wrong date, could alternatively be due to the wrong Cináed being made father of Suibne mac Cináeda.
Gilla Brigte of Argyll's eldest son, Fergus of Galloway, is of a different dynasty to him.
Cináed mac Maíl Coluim (died 971) is the father of Mael Coluim II, and the theory is that Suibne and Mael Coluim were brothers. So that'd be correct.
Gilla Brigte of Argyll's eldest son, Fergus of Galloway, is of a different dynasty to him.
I think I am the one behind that, and it would have been intentional. The scenario makes Somerled of Argyll (whose father is named Gille Brigte) and Fergus of Galloway brothers, a scenario suggested in passing by historian Alex Woolf. It's pretty unlikely of course that Fergus was in his 90s when he died, but it is possible and fun.