Buffalo Bills fans know as well as anybody that constructing a team featuring quality depth is a difficult task and an underrated aspect of roster building. Over the course of the team’s 17-year playoff drought, the Bills fielded what appeared to be talented rosters, only to see a string of untimely injuries to a key starter or two derail a season. Pat Kirwan of SiriusXM NFL Radio, formerly CBS Sports, believes that teams that not only make the playoffs, but also are capable of making a deep push, have one common trait between them: depth to overcome injuries. Kirwan compiled a series of questions regarding roster depth that he believes teams must answer if they are truly built to be contenders. The Buffalo Bills begin training camp July 27 and are coming off of their first postseason appearance since 1999. Following an offseason in which the team made drastic personnel changes, I decided to answer Kirwan’s questions in order to determine whether Buffalo remains on the right track. Obviously, training camp will provide more concrete answers, but for now, this is an interesting exercise that will allow for an alternative look at the Bills’ roster as a whole. Let’s dive…