Hmm. Well, it’s said and done, I suppose, but I really don’t like that answer, especially given that neither of those old questions provide all the information. The first one doesn’t mention their mask switch, as pointed out, but the second one is also half-contextualized. It doesn’t bring up the unique shapes of the masks, which was the reason they were gifted, hence why you’d give someone a mask they already had. Like Greg said in his answer there, he can’t be expected to provide an accurate response if he isn’t presented with all the facts, which he wasn’t in either case.
I’ve always figured the Hagah’s new masks retained their powers, and I think I’ll probably stick with that headcanon/au, simply because it makes the most sense to me. As you pointed out, why go for a random power/shape combination if you’re going for a new power anyway? The Hagah carrying over their old powers, ones they’d be skilled in using at that point, seems like the more effective choice.
But canon is canon unless stated otherwise, I guess. Thanks.