They're holding a spot in case Olden Polynice decides to return
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In all seriousness, Gary Trent's the one guy on that list who merits some interest, in my book. Maybe there's something wrong with him that I'm unaware of and that's why he's not on a roster. But after seeing Greg Ostertag -- yes, he's still hurt -- get bounced around by Danny Fortson in the Seattle game, having someone capable of throwing his weight around in the paint might be helpful. Granted, you'd still want to give Songaila most if not all of the minutes behind C-Webb, but there are times when you need a thug.
I imagine the Kings' roster is still a bit unsettled. They may not be sure yet whether they want to or need to keep both Courtney Alexander and Maurice Evans, and that decision could in turn effect Erik Daniels. Surely a guy like Trent would be more valuable -- even if only as a practice player -- than one of those guys.