Lindsey states that "As a quick note, the higher the level and rarity of the things you are throwing into the forge, the better your chances of getting a Legendary Precursor."
She follows this up later by saying: Though not all Exotics are “created equal” they are all of the same rarity: Exotic.
This potentially means that though the recipes requires 4 exotics, some exotics yield better results.
From this, I conclude that the NAMED greatswords that are created via the forge and as rare drops have the highest yield rate for Dawn or Dusk. Currently there is ~10 named greatswords (e.g. Naegling, Dhuumseal, Breath of Flame, etc).
If anyone is willing to try this, I would recommend they do so as it has the potential to yield ~10 - 20x your cash back. It also means we get closer to discovering a recipe for creating the legendaries.
I am not trying to sell naegling, dhuumseal or any other weapon. I have 27s and nothing for sale on the trading post except for 3 major sigils. So please don't shout and scream and tear up and throw a fit like a child and say I'm trying to sell those weapons quicker. I'm simply theorycrafting here. I am prepared to provide screenshots of my bank, inventory and TP log to prove it. Not only this, I am personally not responsible if this theory does not work, nor will I accept any responsibility if it does work. Forge at your own risk, this is just a theory.
Edited by Mexay, 09 October 2012 - 02:54 PM.