Gale's intro is actually more of a plot hole, imo, than Astarion.
He says, "Last time I saw you, you were in a crucible's worth of blood - an intellect devourer nibbling at your ear."
???
When was I at any point in a "crucible's worth of blood" with "an intellect devourer nibbling at my ear?"
I wake up in a flaming chamber with no intellect devourers or even carcasses of them. I fight imps and maybe a devourer or 2 IF I make the wrong choices. Never am I wallowing in blood with a devourer.
See and the way I see it depending on how much of a head start getting someplace else on the Ship Gale had... maybe when he saw you that was the case and... things just got more wrecked and you survived? Also Gale kinda strikes me as the type to over exaggerate a bit, definitely likes to hear himself talk...
That being said I rather agree with you... great now there are TWO plot holes bothering me...