But considering that so far we are only given 1 fake DS for each element, that is pretty darn rare lol. If they suddenly can mass produce these lachryma and turn everyone into those fake DS then that would be a downer.
And cobra's ability is weird. How the hell can he "hear" what natsu is thinking inside his mind? Your brain doesn't create any soundwaves when you think so he should not be able to "hear" them but that's manga for ya
It's a manga about mages..using magic, they don't need logic!