If it wasn't Tattaglia, it seems to me, the only other obvious candidate who could have been "really behind things" is Barzini

  • Vito's mistake
Vito didn't look any further after Tom unearthed the Tattaglia-Sollozzo connection which I believe exactly as [Barzini]-Sollozzo-Tattaglia intended like Sollozzo was trying to conceal his Tattaglia connection ie: for Tom not to dig any further

Sollozzo played it beautifully, complimenting Tom's gotcha! moment

  • Peace meeting
Vito approached Barzini?
Quote
Vito: Don Barzini, I want to thank you for helping me organize this -- meeting here today
Barzini chaired! the meeting