Carrol will provide more value on the floor than Zbo '18-19 and the contract is the same length. Carrol plays a premium position: small forward and its very hard to get starting level legit sf without paying big money. Kings have only one sf in the roster (assuming they wouldnt have overpaid for VC) so he wouldnt take that much playing time from any kid unless your plan is to play someone at the wrong position. Zbo is a non shooting big (aka center) and Kings have WCS, Papa, Giles, KK and maybe Skal at that position. Having two years of Carrol is much better than two years of Zbo especially when you gain additional assets by taking Carrol. Plus there is a chance we would be able to rehabilitate him back to being an asset.