Burke has actually played in the NBA and had a stronger resume than Hanlan's coming into the league (as evidenced by his winning CPOY and draft stock), so why would you assume that Hanlan will push Exum when Exum unseated Burke? Just because the item is new doesn't automatically make it better. And seriously what is this **** about Exum's work ethic?
Hanlan > Burke, imo --- Burke has been pushing historic lows in terms of offensive efficiency and has defensive limitations.
Regardless of Exum's work ethic, which I'm sure is really good, he's going to be pushed every day in practice going head to head against Hanlan. They're going to be running the same actions. It can only help his development.