Yeah, but the kalashtar started out as exactly the same thing, right? And then somewhere along the line supposedly their quori spirit became "too dilute" or some such crap, and now it isn't a separate, sentient entity. It's more like a shared soul between groups of them. Physically, I didn't know that they'd supposedly... differentiated, though.
The first kalashtar were Adarian monks who offered some rebel quori sanctuary in their own bodies. The other quori didn't follow them because this process was permanent, forever shutting them off from Dal Quor - they had to manipulate events for centuries until the Inspired were created.
Since their quori spirits were permanently bound to them, the monks' children also had the quori spirits bound to them, meaning that the quori was possessing both at once, but with lesser influence. As the kalashtar population grew the quori became spread between too many hosts to be heard any more, or even, it appears, to
think.
Elans are a form of punishment by the Dreaming Dark, where a quori is sealed permanently into a human host with no ability to influence its actions.
As the page says, Quori can "Inspire" anyone who's willing nowadays, though this is only because of the monoliths generating an artificial manifest zone across the continent.
The kalashtar and their allies have set up psionic "shroud beacons" across Adar which block scrying and teleportation. They have shifts to charge them, and guys who keep an eye out for "bubbles" which the Inspired could teleport into if they learned of. Their sages try try to recover details on any type of magic the Inspired try to stamp out, so they have meldshapers, shadowcasters and other obscure stuff running around.
tl;dr - I think Secrets of Sarlona is a cool book, ti tells you about psions and doesn't afraid of anything.
YEAH BABY! Bust out the guitar, and let's rock their worlds! 
And this is why you should have had some golems.
The Super Robot Wars equivalent of il'Lashtavar was
defeated by progressive rock.
