I got the description from the Dresden Wiki.
The differences between the two editions are intriguing, of Jim has done it before with Christmas Eve, but has he been doing this with more subtlety elsewhere? Did he think he gave too much away and then rowed back?
Nameless is the Demi-god of Discord and vassal of Mab and Marcone’s top lawyer, as shown in The Law. I have him pegged as Cowl because it was revealed (1) he was an associate (not disciple) of Kemmler, and therefore would have known exactly what Bob was when he laid eyes on him, and what he contained and (2) he was exiled from the Winter Court immediately after the attack to try to free icebound Lea, suggesting his complicity in it perhaps as the inside man.
Nameless hasn’t been seen in the battles of Summer Knight, Battleground Etc involving Winters forces because he cannot be trusted despite being a heavy hitter on par with the Erl King, nor has he been seen in things like Harry’s birthday party in Arctis Tor involving Winter, nor in other dealings between Harry and Marcone, meaning he has been keeping a low profile around Harry despite being based in Chicago and a Winter Vassal.
His power level would suggest he is below the ladies and therefore NOT immortal, which is an incentive for him to remove the “Demi” from his descriptor with the Darkhallow.
As a Finnish Demi-God of Discord, giving magic books to nascent Sorcerors and Wolf skin belts to the FBI are just him living out his nature (Like Puck in Wild Card) he would do it for shits and giggles. Otherwise trying to link Cowl to those events outside the main schemes of Cowl is a bit difficult. But they are very Nameless.
That kind of makes me think Child’s is one of Nameless creatures, which may be a clue as to what Child’s is. His one known vassal is Ms Lapland, a Finnish Witch (in the old days it took three wardens to bring one in), so Child’s may be something from that Lore. Nameless’ child perhaps? Or Lapland’s? Calling him Child would certainly fit in with Nameless who goes by the nom de guerre Mr Winter Winter, aside from Nameless
He may have been set up to take out Marcone when required, but I doubt either Nameless or Child are aware of Thorned Namshiel, Odin wasn’t, and he has his own inside woman. I would therefore consider Child to be on a par with a Valkyrie as regards power level in that case, as he would be expected to take out Marcone going through one.
It strikes me that it must grate against Nameless nature to work for such a well organised criminal. He has an ulterior motive.