Yeah, I always thought that Fabrizzio was planted there, but then I saw the deleted scene where he was begging the GI's to take him to America and asking Michael all these questions about America.

So, if he was going to kill him, why would he do such things. In fact, as another deleted scene shows, he does end up in America. So, possibly, someone offered him to do the job with the exchange of a business in Buffalo, NY and a green card for America.

But there is a mistake on Fabrizzio's part right there, He botches such a powerful man's assasination attempted and hides out in Buffalo? I mean, he had to of known that Michael resided in NYC.