User blog comment:MarineroLelouch/Power Ranking and Classes./@comment-92.96.32.189-20140215151525/@comment-7418318-20140215191143

Rogue outright told us already that his foster parent was gravely ill and would have died soon anyway if Rogue hadn't killed him. And while Sting didn't say anything similar about his foster parent, Weisslogia looked far from energetic and healthy in that memory we were shown.

The way Ivan talked about Laxus made it sound like the Lacrima could be extracted from a 2nd gen Dragon Slayer again (and that he'd even survive the operation, even though it'd leave him next to powerless).

If so, then those Lacrima probably come from some past Dragon Slayer and were passed down the ages until Ivan managed to obtain them somehow (stole, bought, inherited, won,... who knows). Maybe they were already implanted into several people before Laxus got them.