I dont think Johnson is going to give the Kings much that the current SF on the team dont already give. Firstly, I think that Minnesota will take him at 4, but if they take cousins and he's the one left, then I would trade Noc and hopefully Hawes, along with the 5th pick for Prince and 7th pick. I think GSW would be more likely to go for Aminu than Monroe, so I'd take my chances that he's available at 7.
If Cousins is available I take him at 5th and forget about Prince. I honestly believe that his attitude issues are greatly overstated. Either way, on the court, he is far better than Spencer "I'm a lazy sack of crap" Hawes, so I'd be willing to take the risk on him. His upside is far more than his potential downside. I dont think this is a guy that would (if things went bad) destroy a locker room...maybe just himself if even that. IF he works well with Tyreke, he could change the long term prospects of the franchise...if not, well, at least he'll be on a rookie contract and the kings will still have huge cap space for FA next year, plus they'll get another (hopefully better) lottery pick next year as well.