I have to re-read but Nameless was the tenth child of a god a scion and a Sorceror who had an apotheosis leading to a really major power up to demigodhood status which is why Kemmler was interested in him as a partner, not a disciple. Kemmler would have considered him a peer, and he would scoff at the disciples, as Cowl indeed does.
Ms Laplander is a Finnish Witch and they took three wardens to take them down. She tried to snare Nameless and got taken instead, so he is at the very least as powerful as three wardens, but far older, which puts him at the right power level for Cowl, and why he would be interested in full godhood via The Word. He needs the power to escape Mab. If he had obtained the Darkhallow, Mab might have been the new Ms Laplander.
Suddenly Mab has a part to play in Dead Beat, through Nameless and his connection to Kemmler and her paperclipping of him. The Novella suddenly changes quite a few things we thought were settled, and that was not a throwaway line about the connection to Kemmler.