Because of the misunderstanding concerning SP Lance Lynn, the A's still will drop RP Tyler Duffy $0.5M (2018) to gain roster slot for acquisition of a FA.
On roster just remove SP Lance Lynn.
Lance Lynn is now on the Oakland roster, unless you want to Release Under Contract, because the Red Sox did not revoke waivers. The 72 hour period passed, so his contract passed to Oakland.
The only confusion was related to the Cash Exchange, nothing else.