I don't think its Abbadon.
He was killed, exploded and was absorbed by Kormir, which in turn became a Godess.
And yes there were the Torment Creatures, which were technically Abbadons Minions and lokked a lot like insects, but most of his followers were Margoniter.
Also... in my opinion it would suck to recycle Abbadon. We had him in Sidequests, we heard his Story multiple times and killed him in GW1.
I'd rather have Menzies, which also has Story but we never met him, we just know he exists and that he fought his half Brother Balthazar over the Fissure of Woe.
It would expand the Universe more. 🙂