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The Size of Moss enables a QB to put a ball easily into a place where it's his or no one's
One of the most important aspects that will dictate Moss's level of play is the reason for his return, which hasn't been publicly addressed. Randy Moss already has a career that should land him in Canton, but has never won a Super Bowl. Harbaugh has his team sold hook, line, and sinker on the "Why not us?!" mentality, and rightfully so. In observing Moss's past, it is safe to say that he feeds off the energy, enthusiasm and dedication of his teammates whether that be positively or negatively.
One aspect of this unexpected turn of events that I think speaks loudly, yet silently, is that Jim Harbaugh himself threw the passes for the workout. After leading a team to within a special-teams mistake (or two) shy of a Super Bowl appearance in his first season, it's safe to say that Harbaugh i in touch with the pulse, abilities and needs of his team.
Just last season, Harbaugh bounced Braylon Edwards out of town just as fast as he brought him in, and it probably would have been quicker if not for his injuries "hampering his production." He also took backups from the team he inherited and turned them into key contributors.
In fact, we've seen through actions and heard through words that Harbaugh would be perfectly content with Moss sitting on the bench if another WR is playing better. Moss will know that before the season starts, and that was probably explained to him today. If he is cut by Week 4, the team will be the same contenders that they were before Moss, and Harbaugh will have no issues convincing his team of this concept. Even with Moss's decorated career, I doubt that the team will refrain from drafting a receiver and forcing Moss to earn a starting role.
Since Harbaugh took over the team, the 49ers have seen many players take full advantage of the opportunity to prove themselves to be an asset or to be expendable. Moss's NFL return campaign is in his hands, and one must believe that Harbaugh saw both ability and drive to make this move.