The reason I would have only gone one with Hader is he is the kind of guy the more you see him the better. In 7 games you might see him a bunch and start connecting. Keep him under wraps unless you need him.
They have until Friday but at a certain point it has to do with cumulative season innings too. Jeffress has blown past his career highs in IP. usage. I agree. I would have tried to avoid using either of them with a 6 run lead but what do I know.