The problem with Daniels is he could only agree to sign a rest of the season contract and not a 10 days contract. Spurs could be reluctant to lose the flexibility they have with their 15th roster spot especially if Parker is out for a limited amount of time.
When I look at the FA list (
http://hoopshype.com/free_agency.htm ), I see a lot of PGs with some Spurs' experience: Jason Hart, Mike Wilks, Blake Ahearn, Jacque Vaughn...
Maybe Spurs will go with the best of the list that will accept a 10 days contract.