Ya I agree Dixie. It reminds me of 5 years ago when it was really hard to judge who was on what side.
In this case it's hard to say. On one hand, Arcadi was close to vito and helped run things when vito went to jail. Not to mention that he ran things with Rocco Sollecito. So it wouldn't be out of the realm of possibility that he works with the current leadership of Leonardo and Stefano Sollecito due to past connections and the fact that he, Giordano and Del Baso were still getting a cut of profits while in prison. On the other hand, he has made it known that he wants power. Maybe he wants all the power, and it was mentioned previously that he made frequent trips to Toronto which made the Sicilians uneasy. Maybe he was building alliances for this eventuality.