jackson, butler, and sundov are free agents. keeping butler will put us at 15. now i don't think we can put him in the nbdl and keep his rights, i believe it's only for rooks. IF were talking in reference to the new cba.
I think the rule is that you can send a player to the NBDL if he has 2 years of experience or less. Jackie has only 1 year so he is a prime candidate. However, since he is a free agent, he may play in the summer league, assess his chances, and sign somewhere else if he believes he has the ability to make another team's active roster.