In the story? No.
Yes in the story. Anders kills hundreds of darkspawn all by himself, he was the only apostate in the keep and all the corpses near him had no sign of weapon wound, all fell by magic. He actually becomes hero of vigil's keep. And this is before merging with Justice, imagine his power then.
Velanna actually commits mass murder but it doesn't change the fact that no one but the PC can stop her.
Except he wasn't a golem made with dwarven and Tevinter knowledge, so not one at all.
This is the similarity between blood and Lyrium were talking about earlier, one hungers for blood the other Lyrium. They want to "harvest" it.
10 people is not an army. No matter how you stretch it, Hawke is at the end of their rope, and Cullen lets them leave because he and Hawke are supposed to be friends, per dialogue in Act II. He's not going to attack the Champion of the city for no reason.
You are stretching lol, a mage supporter Hawke is utter enemies with Cullen, the dialogue is actually there. I enjoyed watching templars wet their pants here I actually took screenshots:
Hawke looks at the Templars:

The wet their pants, I just love it how the game focuses on Cullen's foot steps backwards :







I had it personally confirmed by asking David Gaider on the old forums, while usually mages are not united there have been no such alliance between mages like these since many years ago and the war is pretty balanced. We shouldn't underestimate any side.