For the "he will re-sign after clearing waivers" crowd, I feel like I need to explain Hartlieb. Because he has been outrighted before, he had the right to declare free agency upon his outright. I don't know the terms of the contract he opted out of, but he was likely on a minimum deal or close to it.
Hernandez has the same right (greater than 3 yrs service), but he has a guaranteed 7 figure deal he would be opting out of. If he had 5 years he could refuse that assignment and effectively force his release to get paid. His DFA limbo ends tomorrow. I suspect if he clears waivers, he will accept the assignment.