I am not going to float off names because I feel it's really early for that. What Singletary brings is that down the middle type of player.., He is not fast but quick, he not going to run over guys but will evade players in open field, he is not a threat to take it all the way but enough that you have to pay attention to the guy. I like to call this type of player a down the middle type player.
We need a HB that is either heavy on one side of the spectrum or the other. Fast 4.4, catches the edge, can take it the distance any play... OR Truck them... wont get caught behind the line with great strength. nothing down the middle unless its a 3 down RB that can potentially start in this league