>>24835351the one in Xros Wars manga (and presumably the one in Dawn Dusk) are essentially mindless and act on instinct, and both are essentially "defeated" by the things that made them happen move on to something else, not for something in the outside.
Xros Wars manga specifically nene opening up the xros from the inside, dawn dusk the guy who pulled it off prefering to use Chronomon instead, don't know why.