I don't ever want to see someone get hurt, but this solves three glaring issues on the team.
For starters, Hagans, Quickley and Maxey are 3 of our 4 best players. They really need to be on the court together for as many minutes as they can handle.
Second, Sestina is a liability on defense. This should be a good/great defensive team, but that advantage was negated with Sestina on the floor. Teams knew all they had to do was isolate him and wait for him to break down.
And finally, at this point in their careers, Brooks definitely and Whitney, maybe to a lesser degree, are more small-ball 4's than wing players. They both bring a ton of good qualities to the floor, but hanging out on the wing and shooting threes isn't one of them. This will force them to play in a way that they -- and frankly Cal -- may have been reluctant to do otherwise. This, in turn, will open up more minutes for Juzang to hopefully gain some confidence and find his shot, which we will need.
The downside, obviously, is now you are perilously thin.