@KronshiI see what you're saying, but how would he be able to find said pieces, or be able to? At the point tiger's death\dissappearance happened, the war would probably be at it's halfway point, and given his skill, he'd be a frontline fighter. Finding the shards of his gem in the middle of an active battlefield, and finding enough to make a re-creation of him seems like a stretch.
@pyroman I don't know about that one, since the gems of the monsters seem pretty okay, unlike the cluster ones, and if they were shattered, then wouldn't they have a cracked, put-together look to them. I know it not like that for cracks, which kinda pokes a hole in my rebuttal, but this theory seems a bit iffy to me.