This ones tough being an NL only league and 10 man keeper.
IMO Freeman is the 2nd most valued 1b in the NL behind votto(howard hurt and berkman's age).
Promeranz is a very highly ranked young pitcher who can really help your team in the future but also does pitch in colorado.
Papelbon is the #2or3 closer in the league behind kimbrel and MO, so he would def help.
Cahill Im not a big fan of but can be very solid.
Walker i feel is very underrated and can be a very solid 2b and pagan idk about cause there offense just doesnt seem to get it together ever.
Maybe if you can post the rest of your roster....viewtopic.php?f=29&t=445254
"They give you a round bat and they throw you a round ball. And they tell you to hit it square."-Willie Stargell