Pretty sure Antonio Pietrantonio (AKA Tony Suzuki) is no relation to Vincent and Tommy.
But yes, from all accounts, Lopresti was close to Suzuki when Lopresti was murdered and Suzuki had attempt on his life.

I'm interested to know where Suzuki/Lopresti allegiance was during attack on the Rizzutos. I've read conflicting stories that Suzuki was part of the group trying to reach a consensus for control of Montreal (with the others being Montagna,Desjardins and Dimaulo), but on the other hand read that he was close with Augustino Cun-trera, who would have remained loyal to Rizzuto. Also Lopresti was close to Nick Jr. Any thoughts?