CRF was right in the correction he made to my post.
I forgot you can't sign and trade a player who sat out of the NBA for a year. Same with Aaron Brooks in PHX.
I think this is the attempt to close the loophole that Keith Van Horn created in Jason Kidd trade to Dallas in 2008 where he retired but did not file his papers and was then sign&traded to make a deal work and never played a minute. Great job if you can get it - sign for $4M, show up, and leave again with $4M in your bank account.