posted from a file, not sure if there are any typos, didnt go back and recheck
Adaptability: With adapt body he is able to go wherever. He can swim in the ocean and breathe just fine, he can hit the desert and not have to worry. somehow get put in a vacuum? you are good to go. If there is a wall put up he can walk right through it if needed. Meteor swarm? He has fire res 30 and can gain improved evasion if needed. Charm monster? Between mind blank and a will save of +21 I think he'll be ok.
For combat adaptibility he has linked armor to be able to talk with his fellows without needing to speak openly, but then the fighter should have this as well. We arent talking so much about equipment. Both builds should have heavy fortification somehow and the gleaming gives constant concealment for a 20% miss chance. Not too shabby.
The psicrystal is good for moving around and spying on whatever he needs. Also, it could grant the psychic warrior with a plus to a needed skill or to either fort or will save.
This character is also immune to figments and glamors (including invis), along with a pretty decent spot check! Having freedom of movement up makse him immune to being grappled.
Damage output: This I havent even looked at really.
+15 BAB + 8 str + 7 weapon + 2 moral (from banner) = 32 (can be higher with a few other short duration powers up, but I am not counting them here)
=+32/+27/+22
2d6 + 12 + 7 + 1 point of con + dispel psionic (level 15) = (avg) 26 + 1 con + 25 dispel (can be much higher with a simple application of expansion, which would increase the psychic warriors size to huge, adding 10 more damage to the average and possibly lasting for 8 hours as well.. for the above I figured it might be bad sometimes to be size huge so didnt include it)
Against ac 35 the first round has a 90% chance to hit, 65% chance, and 40% leading to an average of 50.7 damage, 1.95 con damage and between 1 and 3 dispel checks on the target.
So I would have to know the creatures hd to be able to tell how long it will take to kill it, but less than 6 rounds is likely. This is when it isnt fighting back. If it is fighting back it dies much faster via the empathic transfer.
Damage absorption: 20% miss chance makes this one a bit odd
AC 31 (I think) yields 95%, 95%, 75%, 50%. Assuming that it can see through concealment somehow, which is possible, and is immune to mind effecting, also possible, then we have: 96.075 damage.
If it was not immune to mind effecting then it would take back up to 92 points of damage and I would be able to use empathic transfer, hostile to regain hp.
If it cannot see through the concealment then the damage drops down to 76.86.
Since I believe I have the extra money I will toss on a ring of protection +5, a ring of blinking would also work out nicely for that matter

Also, a skin of the defender is pretty cheap.
But, with AC 40 this changes to: 80%, 55%, 30%, 5% for an average damage of 51.85 (41.48 with concealment)
So with the addition of these two items the overall aspect comes out much closer to what it should be for this level. It still only takes around 3 rounds for the big bad to kill the psychic warrior though, of course whenever the big bad hits the warrior it takes 23 points of damage unless it is immune to mind effecting.
That is why the psychic warrior has dim door though

to get away when he is in trouble.
Or, he could put up form of doom, inertial barrier, expansion, or whatever else.. form of doom would add on 4 more attacks, +4 to str, an extra 1 point of natural armor, DR 5/-, and faster movement.. each tentacle would deal 2d8 + 5 damage. Definately not shabby. When it looks like a real fight tossing down that power is a very real option and at 10 pp he can do it a couple of times a day pretty easily
Psionic lions charge is also very nice! with form of doom up and blowing the rest of his pp for the day he could kill that big bad in one round!
Mobility: Between having a decent human speed to begin with dim door opens up some major options. If needed having form of doom up adds 10 to the base speed. Sounds pretty good!
This guy doesnt change a lot depending on the fight of the day. Mostly his extra options go away but his base stats likely stay the same. The more of his 44 pp that he spends each battle are less he doesnt have later. Everytime he dim doors is one less form of doom to some degree. Or if he pops up an overchanneled extended augmented expansion for a whole lot of reach and extra damage (lasting 8 hours).
Also, if low on hp he can dump an empathic transfer, hostile on the next group of enemies and be full up again (or at least a good portion of the way there).
Edit: had to get rid of a misplaced 1 (I believe it was misplaced at least).