Arcadi was the acting leader of the Montreal Mafia after Vito Rizzuto was arrested in January 2004. Arcadi, Rizzuto, Nick Rizzuto Sr., Paolo Renda, and Rocco Sollecito seemed to have divided the tribute they received after Vito was arrested, and an argument could be made that the arrangement was the same before Vito went away. In my opinion, Arcadi might have ranked higher than Sollecito, even though all five were receiving an equal share of the tribute.
Do you mean Arcadi over-ranked Nick Rizzuto during that period? Strange though, are you sure it was possible? That Nick left Vito be in charge is already weird imo, but maybe he wanted to get a rest due to age....But, with Vito being taken off the streets, would Nick allow somebody who wasn't even a relative, to out-rank him?
If you are to believe the conventional wisdom of journalists and book authors, they did state that Arcadi was acting boss and that position would put him at a higher level. But we have to put all this in proper perspective. Two of the five Rizzuto family were prominent active members watching over the business. You had Nick SR. regularly showing up at the Consenza bar stuffing his socks full of money. Renda handled the finance part. Arcadi might of had the title but his power may have been more restrictive than that of his predecessor. The Rizzuto family still got 3/5 of all the revenue not including what share of the pie Vito son's received as well.