Derek Carrier has been added for DK and Yahoo (he was on the other sites already), we had an issue with his import due to a conflict with Derek Carr. This has been corrected and should be good moving forward.
Keith Mumphery is listed on all sites, however he is projected for 0 points so you probably dont see him. You can either change his projection, by adding him through the player manager(note the spelling of his name) or you can change your playerpool minimum score threshold to 0 so he shows up. You could then change him to a higher projection, and revert this setting if you wanted. If you have any issues just email into support@fantasycruncher.com