No, but saying that comes pretty close....
As for that "essential" compilation, I for one would leave room on it for "Blue In Green" from Blue Ballads, as well as a few Steeplechase duet things w/Parlan & a cut from a mid-70s album on Marge he did w/Joe Lee Wilson. In fact, I could easily make a full disc of "essential" post-60s Shepp, if one's intent ws to show him at the top of his form over the course of his career. I'll even say that no matter what the era, Shepp's been a wildly inconsistent player. Not all of the Impulse! work is gold by any stretch of the imagination.
(And exactly what are we talking about anyway - the last ten years, or post-1960s? There's a huge difference, especially since he spent the better part of the mid-late 70s churning out album after album that documented his coming to grips with change playing. Those are for the most part some dire documents indeed, and it's not until later in the 70s, when he finally got over that hurdle, that things started to come back around. And then you got the embochure issues of the latter years which slowed him down both musically and professionally.)
If you don't really care for most/all of his post-60s work, hey, no problem. To each their own. But to say that there's a lack of "passion" to even the best of it is, to me, to suggest a definition of "passion" that fits a preconceived notion, a notion that perhaps doesn't give waht I would consider to be the necessary consideration to all the various changes wrought by time. Because afaic, if Shepp was still playing in 2006 like he played in 1966, he'd sound really stupid. That was then, this is now. If 40 years of life doesn't do something to a man, hey, whazzup with that? And if you can't deal with those changes in a meaningful way and give their own validity, what good does it do to live that long?
No, Shepp's inconsistency has been there from the git-go, and it'll most likely be there until the end. I'm not about to claim otherwise, nor am I going to defend all the lackluster, rambling work he's done (from any period). What I will claim is that when Shepp is on, he's capable of some deeply moving playing. That was true in 1966, and it's true in 2006, even if the "style" of playing now might bear but a superfical resemblence to that of then.
Unless, of course, one chooses to define substance in terms of style, in whole or in part. That's one's perogative of course, but it's not something that I myself particularly care to do.