It's possible that Namshiel is more of a lone wolf who just happened to be working with Nicodemus during the events of Small Favor.  He wasn't around when Nicodemus was working on the plague curse, so it's possible that Namshiel has his own agenda.  If Namshiel was set up by either Tessa or Rosa to take the fall by agreeing to launch an attack on Arctis Tor, he's probably not happy with either of them.  He probably didn't like being left behind on Demonreach either.  While it was Namshiel's host who paid the ultimate price, I bet the Fallen don't like being sent into darkness because they never know how long that condition will last.  So Thorny is probably no one's friend.

Me as well, and while one could argue in the context of everything she did die to save others.  It really isn't true, she died stupidly at the hands of an insane careless cop.  Not a hero's death at all.

Actually what I take away from what Mab told Harry is in the end the Council will come begging to him.

She's saving it all up for her teen years. Molly was also pretty good, when she was in sight of her parents. She was dressing provocatively, and changing in the treehouse before she'd go indoors.