Liz wrote- "Eochaid royal scholar, high poet of Ireland, Fíachna mac Báetáin was
inviting him because of his learnedness, since Fíachna was the king of Ulster and
Eochaid was of the Ulstermen"
I think that statement rules out Dallán Forgaill being the Eochaid in the tale
because Dallan was not a member of the Ulaidh. He was from the Fir Lurg, a
branch of the Airgíalla. Eochaidh must be Eochaidh m. Oengusa.