re: What tipped off The Godfather that it was Barzini

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The don recognized the game was changing and michael needed vito's street smarts and experience more than Tom's business savvy

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Vito knew his political and police influence was going to erode and that the drug families were going to get more powerful as he became far less. The Corleone's days in New York were numbered, and there was nothing they could do about it.

Not only did Vito need to direct Michael's moves, he also needed Tom to get a lay of the landscape in the only place where drugs weren't going to be king - Vegas.