Forget Perk versus Shaq. The Big Fella gives the offense a dimension it was solely lacking last year, someone down low that Rondo can dump it into who's going to get two points (or two free throws) 90% of the time. It's easy to fall into a habit of just shooting jump shots when the team's full of jump shooters.
Perk and Rondo are not jumpshooters. Perk could do some of what Shaq does if he stopped dropping passes, bringing the ball down, etc. He won't clog the paint and be as big a target as Shaq, but there are some things he SHOULD be better at by now to help the offense flow better.
They ain't shooters at all. Point is, last season there were a lot of times when the scorers on the floor were all reverting to jump shots. Guys like Rondo and Pierce can and do drive to the rim, but Rondo's often not looking to score and Pierce still sometimes becomes too happy with the jumper.
Whether Perk *could* do the things Shaq does if he didn't drop passes, etc, is irrelevant since he's been in the league for what, seven seasons and is still doing those things. Perk's never going to be a consistent inside scorer, that's fine, that's not his game.
Point is that there were many times last year when - for whatever reason - we didn't have any inside game to speak of. KG shooting jumpers. BBD shooting jumpers. Pierce not driving. Rondo not looking to score. Ray shooting jumpers.
Didn't have someone who can do what Shaq does - drop the ball in down low and let them get two points.
Adds an element to the offense that's been lacking.