From an Orlando perspective the ONLY maybe good thing about no Alston is Lue's 'shoot-first' mentality. The Celtics are playing Alston like he isn't even on the court in the first two games. Lue likes to shoot (he usually misses), and will not pass up the open shots he gets like Alston. If he can hit a few open jumpers the Celtics will have to change up their defensive sets, which could finally allow the Magic offense a little freedom.
The return of Lee is huge for the Magic, assuming he can play effectively. He is the only Magic player that drives to the basket consistently. As you have seen, when Turk drives it's usually without much force. Lewis barely drives more than a few dribbles, JJ shoots from outside, Alston misses layups, and MP has been timid driving to the basket since he hurt his wrist on a few hard falls earlier this season. If Lee can drive to the basket instead of shooting 3s every time Perkins or Davis will move over letting Dwight roam free for offensive rebounds. Further, the only Magic player that has a chance of staying in front of Rondo is Lee. He is very quick and long enough to bother Rondo a little when he tries to pass the ball. Of course he hasn't played in a week and might be horrible tonight, if he is, then forget this paragraph.
Finally, the Magic 'feel' like they aren't getting the same calls as the Celtics, and the home court might give them more confidence to continue driving to the basket even if they are not getting the calls early. With the Celtics on the road I look for the refs to call at least a couple hand checking fouls on Brian Scalabrine (he has been riding the Magic players on every drive and he never gets called for a foul), give Dwight a few more calls (he is being pushed in his waist on most of his hook shots and held by a help defender on his offensive rebound attemps), and for a few illegal screen calls on the Celtics (on every Celtic offensive set there are usually at least 2 illegal screens, some of them being extremely obvious). If Orlando does not get some of the same ref home court cooking, it will probably not win this game.