Boogie is a 1.5 years rental. I keep seeing people say that he's a free agent this summer, but he's a free agent next summer
http://m.espn.com/nba/depthChart?teamId=3
http://www.basketball-reference.com/players/h/holidjr01.html
Hell, Tim Frazier isn't some stellar point guard or anything, but as a backup, he works, especially if they stagger AD and Boogie's minutes so that he can rely on them.
If you have two big men, even if they are very versatile and can play away from the basket, you don't want your guards to focus on scoring by driving in more.
The more intriguing choice, this coming summer, is if the Pelicans make the decision to drop Jrue in search of increasing their guard/wing depth overall. Especially because you know certain teams (*cough cough* NetsSixersNuggets *cough cough*) are going to drive the market for guards up like crazy