FOXBORO — Clearly, the Patriots and Bill Belichick believe Ras-I Dowling has the potential of being a very special cornerback in the NFL or they wouldn’t have spent their second-round pick (33rd) overall on him this past April. After all, there aren’t many defensive backs who stand 6-2, weigh 200 pounds, who can hit, cover and possess a 4.4 in the 40. But early on in his first NFL training camp,…