Greg Oden would bring a completely different dimension to the Miami Heat, on both ends of the floor. On offense, his sheer size and rebounding ability will make Indiana rethink some of its defensive strategies. And on defense, he will allow Miami to employ some schemes that do not lend themselves well to its currently undersized roster.
For example, Miami's most prominent advantage against Indiana is Lebron in the post. However, every time Lebron catches the ball in the post, Hibbert immediately establishes help position near the rim, completely uncovering his man in the process. He does this for two reasons: 1) He knows that Lebron will abuse either George or Stevenson in the post, and 2) He is not fearful that his man, who is typically Miami's PF on the floor, will secure a rebound over him or do anything else to dissuade him from shifting to his help position on Lebron's post ups.
But Hibbert may not be so willing to completely uncover Oden, for Oden is a tremendous rebounder who can effectively take advantage of weak side rebounding opportunities and also convert lob passes. As a result, Indiana will be forced to make a decision to either continue sending Hibbert over to help against Lebron in the post, thus conceding weak side rebounds to Oden, or keep Hibbert connected to Oden and leave Lebron with room to operate comfortably in the post.
On defense, Oden could be a difference maker unlike anyone Miami has had since the formation of the Big 3. I'm sure that we have all heard coaches imploring their players to "Make your opponent feel you!" But Hibbert feels nothing going up against any of the bigs on Miami's active roster. He knows that whoever is guarding him will not even be able to get close to the point at which he releases the ball, so he just methodically backs into position and casts up his shot with complete comfort and confidence.
Greg Oden is a shot blocker extraordinaire, however, with the added advantages of size and strength. These traits will make Hibbert's attempts at scoring significantly more challenging, and will allow Miami to play defense without having to double the post as often as it does now. What's more, Oden can influence a lot more on the defensive end than just his man's efficiency.
Oden is a legitimate rim protector who excels at blocking and altering shots, which will make would be penetrators rethink their decisions to storm the lane while he is in the game. He does not have the lateral quickness to execute Miami's ball trapping scheme, neither should Miami wish for him to do so. My belief is that Spo will use him similarly to how Thom Thibodeau uses Joakim Noah and Frank Vogel uses Roy Hibbert: let him play off of the screen, thus giving up only the mid-range jumpshot.
Finally, Oden possesses an exceptional rebounding radius. His efforts on the glass for Miami will lead to far more second chance points, far fewer offensive rebounds given up to the opponent, and better transition offense and defense, as fewer bodies will be needed to clean the glass and can, thus, be redeployed to transition.