I don't know how reliable a source Lady Sauvage is, probably better than Allomancer Jak but then again she does associate with him. The Monks of Baz-Kor might be made-up or a deflection or an exaggeration,... Her account of her encounter with Nazh does make her seem more trustworthy, in which case I'm much more interested in the pool she mentioned.
As for Harmony's team B: why not simply his own agents, the Kandra, Kelsier and Marsh. Harmony's other choices might not even have been seen on-screen.