This is a very powerful cohort. His hit dice equal your level and he normally has 4 la. He may outshine you all.

Does he get PC-style stats or is he stuck with the all tens array before racial adjustments?

He's viable both as a tank and as a skill monkey. For things like feat and equipment selection, he may have to choose between the roles, but in many ways he can excel at both.

On the tank side he has 8 BAB, d12 hd, 5 attacks and stat bonuses. Multi-attack is vital. Power attack is standard. Look for pounce if you can get it. The damage dice are low and magical weapons are hard to apply -- look for damage bonuses.

On the skillmonkey side, he gets 6+int skills and an int bonus, but an awkward list of class skills. Conspicuously absent are hide, move silently, bluff and gather information. Still, spot, listen and search are always useful, as is sense motive. It's probably worth maxing out lots of knowledge skills. There's a feat in Draconomicon called Draconic Knowledge, which lets you access ancestral memory like a bardic knowledge check, except that DCs are determined by how important the subject is. The creation of the universe is DC 10.

When it comes time to take class levels, I might recommend rogue. It keeps the skills coming (with an expanded class set) and gives the bonus damage you need more than BAB or HP. You'll want to be flanking to give the party's existing rogue sa anyway.