Not my first choice, but not bad at all.  Personally Id rather see Barrowman as a Wampire of some kind, but he's too pretty for me to go with as Marcone.

You're very welcome. If you want me to provide a full sheet I can, I just need to know what neck deep is.

I'm not familiar with him, I'm afraid. I need more to go on.

The bibliomancy Sponsored Magic might be appropriate, though, and there's a guy in the Paranet Papers preview with book magic.

Both are interesting. 

I feel like the first is similar to other things I've read about, but not personally read.  The magic dying thing (only to become resurgent) reminds me of something, but I can't think of what it is.  Maybe Eddings, or Wright?  I'm not sure.

The second is intriguing, as long as it doesn't become a Fullmetal Alchemist + Pirates of the Caribbean crossover.  Sometimes that works (Pokemon + Lost Legion = Alera), but the necessity of it being a pirate tail initially escapes me, other than explaining how they were found, and how they're being chased.  It seems like they could just as easily be buried in a desert, unearthed by grave robbers, and a band of different people must join together to stop them, and be sailed around by a pirate or privateer to find them.  Oh, and it can't end up too much like The Kingkiller Chronicles either. The Chandrian aren't exactly the seven deadly sins, but they're seven creepy doom-bringing beings that may or may not have been humans up until they became hosts to eternal aspects of darkness and evil.

My brilliant husband just came up with the most amazing casting choice for Marcone.  Dolph freakin' Lundgren!

Zoe Saldana doesnt work well for me, mostly because she is too...Mature? looking.  Not that at first that sounds like a bad thing, but the difference needs to be jarring, so Id go for somebody that has more of a baby-face, somebody that looks younger than their years.  And yes, somebody with dimples.  Saldana is a great actress, but doesnt have the look.  For her to work the old-Luccio would need to be extra-old by contrast, to the point were she may not be as believably formidable in a swordfight. 

BTW, I still say Jane Lynch would be perfect for old-Luccio.  As Joss Whedon once said, it's always good to cast comedians in serious roles, because comedy is the hard one.