Again I am of the belief that had Aaron Glenn in his past life been an All-pro LB as well as a highly regarded LB coach then AP is still here coaching DB’s. Unfortunately for AP, Glenn is an expert on DB’s which led a short leash.
I think it’s really as simple as Glenn, who was fighting for his own job, was a former pro bowl DB and DB coach. He was an easy replacement for AP to see if they could shake things up and get a better performance from the secondary.