Shav Randolph is not some kid who has a bunch of upside or can learn all this new stuff. He will be 30 later this year. He's been around the league since 2005.
Shav is what he is. He is an inept offensive player, a horrible shooter of any kind, has little to no post game, is limited in his athleticism and can rebound above average for his size(meaning 6'10" but kind of thin and no vertical). I think he played well here for what was asked of him.
But he got lost on the defensive rotations, had trouble defending the pick and roll and didn't have the ability to defend perimeter PFs or close out on three pointers very well.
He had no business being on the floor in the playoffs. If he sticks, it will because Wilcox doesn't and nothing better presented itself. But with a non-guaranteed contract, and three others also on the roster(White, Pierce, Williams) I could see his waive-able contract being moved in a package like Sean Williams was last year.