I personally think he should have a RB number. First there are only 2 other RBs on the team and a stable of WRs. Second when he steps on to a field, the RB number may confuse a Defense and place slower men to guard him during a shift.
Now personnel wise, I don't know how the league will enforce the number worn by Archer. Does he have to line up more as a WR than a RB now? If that is the case, it is a disservice to have him wear a WR number. I believe the mismatches made with him lining up in the backfield, increase his success to lining up as a WR. He can move to the slot from the backfield in motion, but I don't like the idea of him just standing in the slot from set to snap. This kid needs to be in constant pre-snap motion to utilize his speed and mismatches appropriately.
Additionally, I perceive he is better as a receiving RB than he is as a formal WR. He'll have greater success over LBs and Safeties than he will over Corners.
Now personnel wise, I don't know how the league will enforce the number worn by Archer. Does he have to line up more as a WR than a RB now? If that is the case, it is a disservice to have him wear a WR number. I believe the mismatches made with him lining up in the backfield, increase his success to lining up as a WR. He can move to the slot from the backfield in motion, but I don't like the idea of him just standing in the slot from set to snap. This kid needs to be in constant pre-snap motion to utilize his speed and mismatches appropriately.
Additionally, I perceive he is better as a receiving RB than he is as a formal WR. He'll have greater success over LBs and Safeties than he will over Corners.