Al Jefferson, honestly, has been below-par.
Paul Millsap has been about on par.
One is what he is. A role player. His "on" stretches or nights will showcase him, statistically at least, as a near-star talent, but just as likely, or even more, he will look like a guy that has no business being a starting 4 on a contender (oh, wait...).
The other is...what...he was on a lotto team, or what he's shown for Utah?! Jefferson's biggest problem is, ipso facto, expectation-turned-on-court-expectorate. Jazz management moved on him to be a replacement for Boozer, not Laurel to Millsap's Hardy. Williams thought he could remold him into an all-star, or that the simple fact that he was on a new, playoff-level team would be enough to propel him on the national stage and provide that slot.
Expectation needs to be reality for him. Fairly or unfairly. He can't team with Millsap as a working-class twin tower, the D-League superstar. His stats have regressed, and the question becomes worth of skillsets.
On those levels, he's both questionable and exclamatory. On the latter point, one to one or versus, I'd rather have Jefferson than Millsap. Because, yes, as a base argument you can actually run plays through the guy...assuming he ever learns them. As a post player, he's in another strata from Paul. He's got the tools to create his own offense.
But can he facilitate for others? This is what's dogging him and, quite plausibly, is what is lowering his own offensive efficiency. It's not simply an issue of playing selfishly, but a-near inability to know when to play for his own shot or to dominate through presence and passing out of the post; on that point, the two sides combine, as he can't seem to read either the defense or his own team's playcalling on a consistent basis, he then becomes altogether timid. His own numbers are pedestrian to piss-poor, while the team vacillates between pure Flex and bumbling isolation.
And yet, the silver-lining is that, however unlikely -- and, remember, this has only been a half-season of play -- he could improve. And improve massively. From the standpoint of individual offense, he's the only credible secondary option to Williams.
That he's been so slow on the uptake is highly troubling. But that Utah has a player like Kirilenko that can't even run a lane when called to do so is in another level entirely; Jefferson's may be an airhead (troposphere) but Kirilenko is simply a space case (exosphere), particularly when you consider the number of games that the latter has played for this team, and the amount of money wasted in watching him do it.
Jefferson may be a moron, but that's not nearly as offensive as a player too full of himself to even try.
Between Kirilenko and Millsap, we know what the Jazz are. Jefferson remains a mystery, I think even to himself.
Sad to say, but that's about as good as it gets for this team, beyond Deron.