It's really more of an A-C Connector than a B-B Connector...From the May slide deck for the Massport board meeting:
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These differ a little bit from the August dated slides shared above. I did find it interesting the May slide deck shows a potential B to B connector.
It wouldn’t preclude a B to B connector so you could go from A to C without having to walk all the way around BIt's really more of an A-C Connector than a B-B Connector...