The reasoning for the pick as I understand it:
1)Pre-draft, the Hornets lacked a big who can both stretch the floor and protect the rim. Other than Biyombo at times, they lacked a big capable of protecting the rim period.
2)They have little depth behind Marvin Williams at PF, unless they wish to employ MKG there. And even then, both MW and MKG are a year away from free agency.