This be the answer.
Must own EoD to turn event trinket into a precursor . Thank you.
I think this is yet another time sink like every other collection they released, to keep players engaged and always up to something.
Gen 2 legendaries are far more time consuming than gen 1 and is why i think not many bother with.
And now that gen 3 is tradable with 6 skins to work through, then on one hand you will have ppl that will go through all the pains of making one only to sell and on the other you will have people that will farm gold to buy them. either way it is a winwin for anet .....imho.