Prior to the season-ending injury of David Montgomery, after 13 games Gibbs had 12 TDs.
The same number of TDs as Montgomery, a free agent signing and former 73rd overall draft pick.
The only difference since then has been Gibbs getting almost all the carries (and TDs) in Montgomery's absence.
So, 12th overall or veteran free agent, both produced TDs at the same rate when given equal opportunity. Almost suggests some sort of common denominator...