Greg Jones does not play halfback just because he did in college does not mean he does in the NFL he is a fullback.
The day I see Leon Washington Chris Johnson Felix Jones or Maurice Jones-Drew playing fullback is the day im ok with it being in madden.
Things like this don't happen in the nfl and they shouldn't happen in the game, not to say that them blocking shouldn't be fixed but it also shouldn't be an option to begin with.