Apparently, Doc tried to sign him when he was coach at Orlando. This was part of Daniel's bio on Wikepedia:
Projected as a second-round pick, Daniels waited for his name to be called. The Mavericks' head coach Don Nelson initially planned on using their 2nd round pick to select Daniels (whom they accidentally discovered while watching game tapes of Josh Howard) but his son Donnie Nelson convinced him to trade the pick to Denver instead and assured his father that they would get him one way or the other. As the calls started pouring in on Daniels' agent's cellphone (among the callers were Magic head coach Doc Rivers), it was later revealed that they had a gentleman's agreement with the Mavericks that his client would sign with them in the event that he did not get drafted.
The circle of life, my friends.