I don't see a player like Dwayne Wade considering Sacramento. If we go after a veteran player in free agency, or via a trade, it will most likely be in the Garrett Temple or Arron Afflalo bracket. That is not necessarily a bad thing because Joerger does rely heavily on veteran players and having another option in the rotation could be good for him, but I wouldn't bet on any addition being a big name, nor would I bet on a young upside player coming in and having a big role (if we retain our first round pick).
Draft wise, if we retain our first round draft pick - which would need to fall inside the top ten - then I suspect we would most likely be looking at a point guard. This year's draft class seems pretty deep at point guard and a young upside point guard might be a good addition, but again it would be difficult to pin point exactly how big a role a young upside point guard would have on a Dave Joerger team. It could be the case we draft someone and they sit second or third on the depth chart, so potentially it would not surprise me to see us try and trade that pick away for a veteran.
The thing to bear in mind is that Dave Joerger is not really known for developing young players. In Memphis he tended to place his trust in veteran players rather than young, developing players. The same is happening here in Sacramento...
Our young upside players like Ben McLemore (15 MPG), Willie Cauley-Stein (11 MPG), Skal Labissiere (6.6 MPG), Malachi Richardson (5.9 MPG) and Georgios Papagiannis (4.5 MPG) are all at the bottom of the usage chart for the current season.
Compare that with the veterans that have some starts and/or are used in the rotation: 31 year old Anthony Tolliver (21.7 MPG), 31 year old Arron Afflalo (23.8 MPG), 36 year old Matt Barnes (24.6 MPG), 29 year old Ty Lawson (25 MPG), 30 year old Garrett Temple (26 MPG).
Now I appreciate that we are trying to chase a play off spot this season and not another top ten draft pick. So that means Joerger will use players he trusts in his system, but that in turn means that our young, upside players are going to struggle for minutes because they get lost in the rotation. Take WCS for example, his minutes have almost been cut in half from his rookie season because Joerger is using pairings of Cousins-Koufos, Cousins-Tolliver, Cousins-Barnes (etc) and not using WCS as much in the rotation. This is because Joerger relies heavily on those veteran players to keep games close and to close games out. When he looks to his bench, it is often to bring on a veteran player rather than a young, upside player. With that in mind, the presence of Malachi Richardson and (potentially) Bogdan Bogdanovic will most likely not prevent another veteran shooting guard joining the team next season.
You are right that it doesn't make sense to add another shooting guard and block minutes for Malachi and (potentially) Bogdan. However, we don't really have a coach that invests on the court minutes for player development, he uses veterans. Don't get me wrong, I can see why we have gone for Joerger and are buying into his mentality and approach, but the issue with that is young upside players will most likely take a backseat unless they prove themselves worthy of an increase in minutes, which is hard to achieve when the veterans take up much of the available minutes and roster spots.