If Shaq is a better all around player, why is he available for the veteran's minimum? If he's a better all around player, why has Doc said the Celtics wanted him on the court in the Cleveland series?
Some possible responses:
1) Shaq wasn't going to the highest bidder this time. His dollar value consequently measured by this contract.
2) Mike Brown was the 2nd worst NBA coach last year (behind Nellie), and didn't know how to use any of his players, including Shaq. Though Doc said he wanted him on the opponent's lineup, he's also starting him right now (and ahead of JO in that brief window of his heath) ahead of BBD, who is very mobile for his...ahem...girth.
No question Shaq is not himself of 2000-2002 (the Finals MVP years), and now a coach has to figure out how and when to use his weapons while avoiding exposure by his weak areas. During the Middle Years (between dominance and present role-player status), quite a few coaches (and Shaq himself) didn't figure out how to use him. Doc, IMO, has mostly worked it out. Shaq is actually getting better defensively right now, more than I've seen him in quite a few years.
I'll piggy-back on this, as I've seen the "Doc wanted Shaq on the court" argument used several times and I think it's a poor argument for several reasons.
1) (Last year) Shaq didn't fit next to LeBron. Offensively and defensively, Shaq was a round peg in a square hole for that team. The Cavs defense needed an anchor, and with Shaq starting next to Jamison they had none. And offensively, one of Shaq's best traits is his ability to either attract defensive attention (thus opening things up for teammates) or to score from point-blank range off the set-up. This didn't fit what LeBron needed. Shaq may have drawn attention from defenders of the Cavs' lesser players, but he wasn't freeing up space for LeBron. And, in fact, LeBron wants to run and/or drive the lane, two things that Shaq was actually a hindrance for.
In short, Doc wanting Shaq on the court for CLEVELAND has very little to do with his value to the Celtics.
2) Shaq DOES fit here. Offensively, we play at a pace conducive to Shaq (unlike LeBron's ideal). We have strong offensive options at the other 4 positions and an equal-opportunity offense with good shooters...thus, Shaq's ability to either draw defensive attention or take advantage of the mismatch IS a big positive to our offense (unlike Cleveland last year). We also have excellent passers at most positions, allowing Shaq to score at the rim on easy set-ups instead of having to post up (a part of his game that has slid). In other words, Shaq fits extremely well into our offense (and it shows vividly in the admittedly small sample size, as the Celtics score 119 points/100 possessions with Shaq and 106 points/100 possessions with him on the bench).
And just as important, Shaq also works reasonably well defensively on THIS team. The biggest key with Shaq is that he is not very mobile as a defender...so you have to pair him with a defensive big that IS. For Cleveland last year, the Shaq/Varejao pairing gave up about 100 points per 100 possessions together...essentially the same as what we gave up with the KG/Perk pairing. It was only when Cleveland tried to match Shaq with Jamison or Hickson that their defense struggled (110 points/100 possessions). In Boston, playing next to a healthy Kevin Garnett in the helping defensive scheme that we run, Shaq is fine as a defender. In fact, with his size and willingness to be physical he has in some ways made our interior defense nastier with the no layup rule. I like it.
3)
Shaq is just better than Perk. I've been saying it for years, and 14 games into a season with no Perk at all I've seen nothing to dissuade me: Perk is a nice defensive role player, but he is NOT a defensive star. He plays his part well, rotates hard, is a better help defender than Shaq. All of that. But he isn't out there making a huge defensive impact. Yes, it's still relatively early. But you can't just ignore that right now the Celtics as a team are giving up 100.8 points/100 possessions...a better mark than they posted either of the last 2 years with a fully healthy and playing well Perkins. Their defense isn't struggling, and without a strong argument on that side of the ball Perk doesn't really have a leg to stand on IMO.
Conclusion: Long story short, Perk isn't really missed that much on defense. But conversely, Shaq is making a big difference in the team offense. I agree with the OP, this isn't particularly close. I'll be happy when Perk comes back because he does bring some good things to the table and he's earned a place at the table for this team, but I'll be happy to have him back as depth and for situational purposes. Barring injury, I'll be very disappointed if Shaq isn't out there with our main unit in the postseason.