I may be one of Exum's biggest supporters on this site. However I agree with the bring him along slowly to start the season. If he takes that job from Hill then so be it. And if he can take the Job from Hill in the preseason/Training camp then even better. But you can't just hand it over to him. This season is too important for the team going forward to allow that to happen. I love Exum's defense, but Hill is a good defender as well, and Hill brings more on the offensive side, or at least going by their previous seasons. If Exum has made serious strides on offense then he should be able to push for that job anyway, if he hasn't then he needs to learn from Hill and improve going forward.
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If this was the start of last season and we had Hill and Exum I'd be all over starting Exum because the season did not matter that much. But for this season they need to show they can win, they need to learn how to win, and they need to show their players that they can be competitive going forward.