Yes Leach was the HC and it's his job to ensure the D is getting good players. He runs the program. I'm not absolving him of blame. I'm saying the guy who was referred too as the "HC of the defense" didn't do good at his job.
It's like a murder charge- 2 people can be charged with the same murder and both given 20 to life. One of the defendants doesn't get to say "yeah I also shot the victim, but like the murder was the other defendants idea in the first place so I should go free.". Leach AND Arnett failed the D, they both get blame. But one one of those guys is still relevant so yeah I"m more concerned about Arnetts roll in this mess