Oro's BINDING was stronger. That means that they didn't have the chance to, like you said, release the jutus or to crumble away due to their lives being fulfilled, like Sasori. By completely ridding Edo's of their personalities and turning them into complete killing machines, you take away from their effectiveness in battle.They don't use their specific strategies that would most likely work best with their skills. Kabuto gave them a task and let the summons go about it as they wanted. That made them more versatile than when Oro summoned Hashi and Tobirama, but also more likely to go rogue, like Madara, or vanish. Hiruzen was a beast though and deserves credit for taking out two hokages. I still believe that an alive Hashi vs Hiruzen would result in Hashi winning unless Hiruzen resorts to reaper death seal, again, mainly because of Hashi's healing factor and flowering tree world.