Warpriest armour from runescape gwd

I know that if you had bought Warpriest armour from the renown shops in the World Events, the drop rate of Warpriest was increased when trying to retrieve them from killing GWD mobs.

What I want to know, though, is that if you hadn't bought them from the renown shops in the World Events and receive a full set as drops from GWD, does it "unlock" the increased drop rate as if you had bought them from the renown shops?
Or would the drop rate always remain lower than if you had bought them from renown shops?

Also, if I bought certain pieces of Warpriest armour during the World Event, but destroyed them before the event ended, would they count as having been "obtained" and thus trigger the higher drop rate at GWD?

Mainly looking for a JMod answer, since they are much more likely to know the mechanics behind drop rates, but if anyone else asked before and knows the answer, that works too.