So Nicodemus once a year can use his Barabbas curse.  He attempted to kill Dresden with it, but Shiro took Dresden's place.  According to the Bible, the people had a choice.  Release Jesus who had done nothing wrong, or release Barabbas, a known criminal.  The people chose Barabbas.  I suspect that Nicodemus is able to choose who lives, or who dies, once a year.  In this situation he used it to save Blood on his soul who was smashed to paste, and should not have survived.

The Genoskwa is ridiculously powerful.  Add Ursiel and he probably can't be killed outside of some very specific method.  I'm saying the block squished him to paste, but he probably wasn't killed by it.  Hades is a cave, and the genoskwa was very skilled with earth magic. Maybe ursiel kept him alive and he figured a way out on his own that only he could take.

 Hannah is dead Because She is just a vessel for Lasciel. The coin was the special part about her.  Unlike the genoskwa, she is just a person without it.

Maybe the Genoskwa gave Hades Ursiel's coin as payment to leave.  Hades is a collector, after all, and his collection was just destroyed, robbed, and given away. 

We don't actually know how, specifically, big... feet? can be killed.  We just know valkryies and einharjar killed them.  Those aren't regular opponents, like vikings.  Odin and other Norse gods were probably involved.

The naagloshi couldn't really be killed either, except under certain conditions, and even then it could just be a temporary phase shift from corporeal to incorporeal until a power level or time limit is reached.  The question of the day...

Who wins in a fight(with no rules because they would both cheat anyway)?
The Naagloshi or the Genoskwa?  I'd love to read that!

Harry wonders if they make bullet proof vests for dogs when mouse gets hurt.  Why doesn't he enchant a fetching doggie tuxedo?  For that matter, why not make Karen, Butters, and Michael some bullet proof stuff?

He was worried about Michael, who had to rely on Charity being awesome and thinking ahead to save him on the train, so why not lay the enchantment right on his tabaed for him?  Hell, a jumpsuit under the armor would have prevented the incident at demonreach,  right?

Help me out here... it's killing me. (And crippling Michael)

Assuming Tavi is part of a lost Roman legion, it's 2000 years roughly since they got to Alera.  That would easily put them at the same time.  Dresden being related is a stretch, since the whole legion was swallowed.  He'd have to have been related to a family member that wasn't swallowed by the portal 2000 years in advance.  Just stretches the imagination.

Robin Hobb's Liveship Traders explores this.  Though it's sail, not steampunk.

That's exactly what I thought during my first read through too.  Parallels are obviously being drawn, at least in the post production personality side (I doubt the wood is dragon spit in Jims books)