Against Florida State, the four Big Men combined for only 76 minutes. Brooks played 25 minutes, Kessler 24, Bacot 15 and Sharpe played 12. It's always a zero-sum game regarding minutes. Competition and depth are wonderful. Inevitably, at least one of the four will be disappointed with his playing time
It appears to me in reading your post that you are making the assumption that one or more of our big men are or will become disappointed with reduced playing time. I would be disappointed in them if this was NOT the case.
When and where is playing time earned and established? In practices or games? It is earned in practice, and if your practice play is carried over into actual games, you earn even more time. This has been a time honored and established procedure in team sports since it's inception. You also incorrectly assume that a player(s) becomes dissatisfied when their minutes are cut or reduced. In making your assumption, you fail to realize that the "team concept" is paramount to theirs and any team's success or failures.
If another player has surpassed you in playing time, there has to be a reason for this. In the case under discussion here, it is evident that Walker has proved himself in practice and has begun proving his worth in minutes given. Playing time will always fluctuate due to the ebbs & flows of games and players. You also make the mistake of assuming that players do not or cannot understand why their playing times are being eaten up by another. They are very much aware of why because they are told by Roy and if they want their playing time back, the incentive here is to PLAY BETTER.
There are plenty of minutes to go around for all 4 and no reason for any of our big men to be unduly upset about their court time as it now stands. In the scope of "team play", as I have mentioned, you do not credit any of our players with enough wisdom to step back for the ones that make our team more competitive and just better.
When recruiting players to come play @UNC Roy follows the guidelines set out by DES. Coach only recruited players that were able to do classwork, were talented, who could fit within a "team concept" and were "team oriented". Given that, it also means that the individual being recruited would also understand that playing time had to be earned and not a minute of it given. Also, it was imperative to treat all players fairly, NOT EQUALLY, but fairly. Our big men are treated fairly, so their disappointment, if any exists at all, is of their own making and they alone have to remedy that.
Suggesting that there will be discord amongst the team due to playing time is suggesting a problem exists where none does and that you are wishing it into existence.