I didn't look into Abelas as much as I probably should have, but I've been wondering lately... His name literally matches the Well of Sorrows. Is he just a protector of the Well or was he a high priest? Wouldn't he recognise Solas if he was? Hmm...

It seems the Abelas is a higher rank than the other guardians in Mythal’s temple, but I’m not certain if he is a high priest. After all high priests of Mythal all added and took knowledge from the Well, but Abelas obviously did not.

I think he is more like the “captain” of the guards, rather than a high priest and I’m not sure he would know Solas/Fen’Harel because of this. He would have heard stories of the Rebel God, but he probably never met Fen’Harel in the flesh and therefore doesn’t know more than the grand image of a dreaded wolf leading an army against the Evanuris.