I think they could find a better version of Hayden in the cuts if they really wanted to do it. They might have to sign a vested veteran which would guarantee their salary, but there are probably run pluggers available. They might as well get some super wide body with no pass rush skills because Hayden has no pass rush skills either. At least the wide body would be able to hold up against the run which Hayden isn't really doing.
Physically, I really think T. McClain is what they want, but obviously he's out injured.
The version of Josh Brent that we saw just before his accident would be a great addition to this defense. He was a real Bull. He wasn't much of pass rusher, but he could drive OLinemen back into the QB.