How come Triple H didn't mention Scott Hall as one of his friends?

because Hall has made it clear getting involved w/ the business again is a threat to his sobriety -- he missed HBK's Hof Induction for that reason

Nash is Back obviously and actively part of the angle,

-- HBK popped up at a SD! taping to do stuff for the live crowd and is theoretically open to do other non wrestling work for WWE..

-- and Waltman is on speaking terms,

meaning that in theory when HHH and Nash collide; they could appear as respective 'cornermen'

-- golden rule of promotion... don't talk about what you can't deliver

I wondered that too then remembered- HHH doesn't do anything in the ring by accident. He is extremely calculating and deliberate. Either WWE wants to distance themselves from the ticking time bomb that is Scott or it will come up again- probably in the form of an angry screed by Kevin Nash.

To the person above me- Sean Waltman IS X-Pac. And he was largely talking Kliq (the hand signal he made), which Batista and Flair were not a part of.

Scott Hall takes drugs, bad reputation for WWE Universe

Maybe because Nash was one of his closest friends. Maybe everytime Levesque is in dire need, Nash can come and comfort him. Well, it usually goes with the storyline so I will just preserve it the way it is begin going.

with his history of drugs and his bad reputation, wwe will want to keep clear of hall at all costs

Well may be he didn't mention him because he was only naming a few. He named Sean and he was in that porno with Chyna

He didn't mention Ric Flair,Batista and X-Pac either.

Want nothing to do with his bad reputation

He didn't want to.