Good thought, Dooley36. That does add a 'shades of...' perspective to the situation. Tessio aided Barzini in the past, now Barzini returns the favor. Brothers bound by treason.

However, Barzini being the kind of Don that he seems to be, I can't see that he would honor the deal for long. He'd look to consolidate his power and assets fairly quickly I would imagine.