In the end even if he could successfully cultivate Hans into becoming a true powerhouse, he would be like an extrey sharp sword in his hands.
Effective and able to follow through with even the most dangerous orders without hesitation but would still pose the risk of harming himself.
Dante's eyes flashed with a strange light as he looked at the boy kneeling towards him.
The poor boy didn't know that all sorts of risks and possibilities were flashing though Dante's mind. If Dante thought that the boy was truly uncontrollable he might just kill him there. No point in keeping a tool that's not useful and Dante wasn't one to share talents and let them be cultivated to harm himself, if he couldn't use it he may aswell break it so nobody else could!
these dangerous thoughts were flashing through Dante's mind whilst the potential victim was kneeling to express his loyalty towards him.