Molecule Man kills everyone if it's Pre or Post retcon in round 1
Round 2, team 2 only lose if we're looking at purely Owen's feats from those two Dark Avengers issues (he had a few good ones but not on the scale of some of his other feats), but if we're considering Post Retcon Owen (not just his last appearance) which is current Owen, seeing as there was nothing to suggest he'd been depowered in DA (just some standard Sentry PIS at the very end of the arc), team 2 win.
Team 2 in both. MM is more than the sum of 2 appearances. If I read a comic tomorrow where Superman is beaten by Killer Frost or whatever villain is being used as the main antagonist of the arc it doesn't just throw the rest of his current era continuity out of the window because of his last appearance.