I guess, those e-mail conversations could give a clue to many people that who Satoshi can be, but they still won't be able to find the mysterious creator of Bitcoin. I'm sure they'll try their best to force Adam to know more details about Satoshi based on those e-mails.
I don’t think they can track and get to know who the real Satoshi is through that email sent to Adam. Adam could also have no clue to it since Satoshi always wanted to remain anonymous and not known. With the knowledge of cryptography they had and how wide they’re in technical terms of this century’s digital technology, they can anonymously continue chatting with each other till day without the parties knowing the whereabouts or any traceable clue of each other if they chose to.
Perhaps it was one of their early failures, and satoshi didn't want that their involvement in the project to be known. Or I am just a conspiracy theorist.
B-money has been in existence as history shows, so it could just be as you’ve assumed it, they didn’t want their involvement in the failed project or make Adam or others think that they got to build on the idea of the past project to make theirs work.