I know what you are trying to say, but I disagree with the premise. When you get down that far on the 53 man roster, these guys aren't about "position", they are about contribution.
I can assure you, the Rams don't consider keeping a Chase Reynolds and slotting him as a RB. Much the same way that McQuaide isn't really a LB, which technically, he is listed as one. Whether or not they choose to keep a LB over a RB, or a CB, or a 5th Safety is irrelevant as long as they can justify their place on Special Teams.
Look back to recent past, the Rams had a player namce Dominique Curry, who made the team exclusivley as a ST player. Although he was listed as a WR, he was not going to make the roster because of his receiver skills. Much that same can be said with players like Reynolds, or Bates, and at this point, even a Mo Alexander. They will be forever buried on the depth chart as a positional player, but are key players on all of the ST's.
