Id have to agree with Melkor. Of all the 2.0's Ive done, many times camping WW for dragons to spawn, only once have I gotten a Melafen kill. He has to be 24 hours. Your best bet is to kill the little named, plus if your working on multiple 2.0's you have a really good shot at getting enough fragments to make 2 tears. Mel only drops one if I remember right
The idea behind this is - you can farm the little dragons on your own or with a friend, but Melafan used to be (!) a raid target but has 100% drop chance on the other hand.
Item Change -> Reload needed Spell Change -> Reload AND new Spellfile needed
Melafeln drops the full tear unlike other other dragon that has a chance to drop on part of it only. I killed her twice for two of my toons which was a great gain of time since they were done with that part of the quest in a single shot.