Whether this Alpín has any connection to the "Elffin son of Crup" who the Annals of Ulster say was besieged in 742, by whom is not said, is not known. Likewise, whether there is any connection between this Alpín and the Alpín mac Echdach who may have ruled in Dál Riata in the 730s is also unknown.
Whether this Alpín is related to the "Elffin son of Crup" who, according to the Annals of Ulster, was attacked in 742 by an unknown party, remains unclear. Similarly, whether there is a connection between this Alpín and the Alpín mac Echdach, who may have ruled Dál Riata in the 730s, is also unknown.