AP Photo/Michael Conroy Purdue’s Aidan O’Connell could be a really good system fit for the Patriots if they decide to draft a quarterback this April. I have long been a firm believer in the philosophy of Mike Shanahan and Mike Holmgren when it comes to quarterbacks and developing the position. Draft as many of them as you can. Both Shanahan and Holmgren believed that by drafting or signing quarterbacks every……